Answer to Question #3108 in Algebra for madiha
find the cost of 2 books and 7 pens.
Let 1 book cost a Rs and 1 pen cost b RS. Safia bought 3 books and 5 pens for RS60. So,
Each book costs 5 times as much& as the pen, so
So we get system
3*(5*b)+5*b=60 -> 20*b=60 -> b=60/20=3 RS.
Then 1 book cost
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