Question

Q. 41. Two books and 3 pens cost Rs. 45. Find the cost of 4 books and 6 pens.
(1) Rs. 90
(2) Rs. 60
(4) Rs. 80
(3) Rs. 70
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Answer 1

Answer:

(1) 90

Explanation:

let book is b and pen be p and cost is x

2b+3p=45. (1)

4b+6p=x. (2)

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multiply by 2 in 1 and subtract

4b+6p=90

4b+6p=x

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0=(90-x)

or x=90

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