Question

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Answer 1

Answer (3) :-

(i) cost of 1 pencil = Rs.5

cost of x pencil = 5* x = Rs.5x

cost of a pen = Rs.10

cost of y pens = 10 * y = Rs.10y

So, Total cost For Rajiv = 5x + 10y = Rs.5(x + 2y).

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(ii)

→ Height of surabi = h cm.

→ height of shamli = ( h - 5)cm. [ As her height is 5 cm shorter than Surabi).

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(iii)

→ Let sameer Think of number is = x

→ Adding 2 in This he gets = (x + 2) .

→ Now, dividing it by 10 , he gets , = (x + 2)/10 = (x/10) + (1/5)

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Answer (4) :-

(i)

→ a + b + c if a = 5, b = 7 , c = 9

→ 5 + 7 + 9 = 21

(ii)

→ pq + qr + rp , if p = 2 , q = 5 , r = 3

→ 2*5 + 5*3 + 3*2

→ 10 + 15 + 6

→ 25 + 6

→ 31

(iii)

→ 4a² - 12ab + 9b² if a = 1 , b = 2

→ 4(1)² - 12*1*2 + 9(2)²

→ 4 - 24 + 9*4

→ (-20) + 36

→ 16 .

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Answer (5) :-

(i)

→ y + 9 = 12

→ y = 12 - 9

→ y = 3

(ii)

→ x - 4 = 2

→ x = 2 + 4

→ x = 6

(iii)

→ (3y+1)/2 = 5

→ 3y + 1 = 5*2

→ 3y + 1 = 10

→ 3y = 10 - 1

→ 3y = 9

→ y = (9/3)

→ y = 3

(iv)

→ 5y = 25

→ y = (25/5)

→ y = 5

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Answer 2

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