Safia bought 3 books and 5 pens for RS60. Each book costs 5 times as much as the pen,
find the cost of 2 books and 7 pens.
1
Expert's answer
2011-06-14T09:46:46-0400
Safia bought 3 books and 5 pens for RS60. Each book costs 5 times as much& as& the& pen,& 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, 3*a+5*b=60. Each book costs 5 times as much& as the pen, so a=5*b. So we get system a=5*b 3*a+5*b=60
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