Let, present age of father = x   and present age of son = y According to question,                   x + y = 70 .............. (i) and x + (x - y) + x = 112    3x - y = 112 .....

Here, the largest number = 30.          There are 7 consecutive even numbers. The largest number = 30. Second largest number = 30 - 2 = 28 [ there is difference 2 in between every two consecutive even numbers.] Similarly .....

धातु: विधुत् र तापका सुचालक, म्यालिएबल, डक्टाइल र विधुतीय धनात्मक गुण भएका तत्वहरुलाई धातु .....

Now,  ∡XYZ =  ∡XOZ/2 [ relation between inscribed and centre angle]                        = 240∘/2 = .....

.....

.....

Simple cell and dry cell are examples of cells. Here, simple cell consists of dilute sulphuric acid in a glass vessel. Hence, it is difficult to carry it from one place to another. It may spill out when carried from one place to .....

Explanation You may have seen batteries. Dry cells are commonly used today, in the form of batteries. Dry cell batteries are less expensive for manufacturers. Since the dry cell does not contain liquid, it is easy to transport and .....

You may have learnt about semiconductors. Semiconductors are those which follow both the character of metals and non-metals. Silicon is a semiconductor as it has both the property of metal and non-metal. It allows small electricity to flow .....

  ∡ABC + ∡ADC = 180∘ [ Being opposite angles of cyclic quadrilateral] or, ∡ABC = 180∘ - ∡ADC = 180∘ - 110∘ = 70∘ Again, ∡ABC + ∡BCE + ∡BEC = 180∘ [ Being interior angles o .....

∡PSR = ∡POR(obtuse)/2 [ centre angle is double of inscribed angle]            = 170∘/2           = .....

∡EAD = ∡BCD = 100∘ [Exterior angle of cyclic quadrilateral is equal to opposite interior angle]      ∡DCA = 50∘ [ AC is diagonal of ∡BCD ] or,  ∡DCA  = ∡ABD = 50∘ [ Inscribed .....

Area of ∆ABD = (6 x 5 sin30)/2 [ area of triangle = (absinA)/2]                          = 30/4                       .....

∡QSP = ∡QRS ........... (i) [ opposite angles of parallelogram are equal] ∡QSP + ∡QRS = 180∘ [ sum of opposite sites of cyclic quadrilateral is 180] or, 2∡QSP = 180∘ [ from (i)] or, ∡QSP = 180∘/2 = .....

∡PRQ = 30 [ ∡PRQ and ∡OPQ are alternative .....

.....

∡EAD = ∡BCD = 100∘ [Exterior angle of cyclic quadrilateral is equal to opposite interior angle]      ∡DCA = 50∘ [ AC is diagonal of ∡BCD ] or,  ∡DCA  = ∡ABD = 50∘ [ Inscribed .....

∡ACB = 90∘ [ Inscribed angle by semicircle]      ∡ACB + ∡BAC + 50∘ = 180∘ [ being interior angle of triangle] or, ∡BAC = 180∘ - 50∘ - 90∘ = 40∘ (i)  ∡BAC .....

∡ACB = 90∘ [ Inscribed angle by semicircle]      ∡ACB + ∡BAC + 50∘ = 180∘ [ being interior angle of triangle] or, ∡BAC = 180∘ - 50∘ - 90∘ = 40∘ (i)  ∡BAC =  ∡BDC = 40∘ [ .....

.....

.....

Here, N = 30. We know, Q3 = 3N/4th class                        = 3 x 30/4                        = 22.5th class.   .....

Here, AB = BD = 10 cm.   ∡ABD + 65 + 65 = 180 [ being interior angle of triangle] or, ∡ABD = 180 - 130 = 50  Again, ∡BDC + 115 + 35 = 180 [ being interior angle of .....

Again, ∡ BAD + x = 180 or, x = 180∘  - ∡ BAD = 180∘  - 61∘  = .....

Here, ∡ACB + 70∘ + 50∘ = 180∘ [ being interior angle of triangle] or, ∡ACB = 180∘ - 120∘ = 60∘. Again, BC = AD = 13 cm [being opposite sides of parallelogram] Now, area of traingle ABC  = (1/2)AC x BC .....

.....

Here,  AOCB is rhombus, So, < BAC = < BOC = y [ opposite angles of //gm] Ref. <BOC = 2 of <BAC  = 2y    [  central angle is twice of inscribed angle on same arc BC] <BOC = 3600- 2y Finally, 3600 - 2y = .....

.....

Here,  Ref.< AOB = 2x         [ central angle is twice of inscribed angle ao same arc] So, < AOB = 360o - 2x  [ A complete turn] In triangle, AOB < OAB = < ABO = 20o        .....

Here, PS = PQ, So, < QRP = < SRP = y ( say)  [ equal chords makes equal angles] Again, we know, <QPS + < QRS = 180o  [ opposite angles of cyclic qd. ] or, 130o + 2y = 180o or, y = 25o Hence, <PRS = 25o is required .....

.....

.....

A flower having all four floral parts is complete and a flower which lacks one or more of such parts is an incomplete .....

There is no natural death in these organisms. There are no remains of parent body cell and parent cannot be said to have died. In fact, after binary fission, the parent starts living as two daughter cells. That is why amoeba is considered as .....

Then the left ventricle is filled with the oxygenated blood  by contraction of left auricle and right ventricle is filled with deoxygenated blood by the contraction of right .....

.....

You may have learned about fertilization. Fertilization means the fusion of male and female reproductive cells. Fertilization occurs either inside or outside the body of the female .....

There are three main types of blood cells found in the body. These are the red blood cells (erythrocytes), white blood cells (leukocytes) and platelets (thrombocytes). Platelets are the blood cells that are responsible for blood clotting in the .....

Mature red blood cells and platelets of mammals don’t have a nucleus.    The absence of nucleus allows RBC to carry more hemoglobin and therefore carry more oxygen .....

Look at the following picture. It shows the different components present in the blood. Here, the yellowish fluid in the blood is plasma. Hence, the colour of plasma is .....

Along with water, plasma carries salts and enzymes. It also transports nutrients, hormones, and proteins to the parts of the body that need it. Cells also deposit their waste products into the .....

You may have learnt about blood cells. Blood cells are of three types. Red blood cells, white blood cells, and platelets. White blood cells (WBCs) are colourless and contain nucleus. Here, WBCs are produced in bone .....

White blood cells are different than RBC. They are colourless and contains nucleus. The average life of WBC is about 5-21 .....

Red blood cells are produced in the bone .....

Here,  In △ MUN is congurrent to  △UNI,   since, MN = UI , <UMN = < UIN and UN = UN ] So, MU = IN  [ corresponding sides of congurrent triangles are equal] < MNU = < IUN ........1) [ .....

From figure, feasible reason can be has vertices, (3, 0), (6, 2) and (0, 2)          Vertices         P = 4x - y        Result      (3, .....

हामिलाई पहिलेनै समिकरण दिएकोले त्यती लामो गरिराख्नु पर्दैन .....

You may know about approximate value.  So, 70.98 = 71(approximately)  and 35.49 = 35.5 ( .....

Here, let the common ratio be x, then  n(E)=3x  and n(M)=2x n(U)=120=n(EUM) n(E∩M)=30 Now use the formula, n(EUM)=n(E)+ n(M)-n(E∩M) or, 120 = 3x + 2x - 30 or, 5x = 150 or, x = 30 Then n(M)=2x= 2 x 30 = 60 Which is .....

मानिसभन्दा प्रकृति ठूलो (बलवान्) हुन्छ । विपक्षबाट चाहिँ पक्षलाई अध्ययन गरी एकपटक आफैँ लेखेर .....