The cost of 18 ruled books is 324. The cost of 20 unruled books is 340. Which book is
less expensive?
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Answer:
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Answered by
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Step-by-step explanation:
My trick is the easiest one
you said the cost of one book is twice as much as a pen.
which means Three books are equal to 6 pens
3 books=6 pens
we have 4 pens
6 pens+ 4 pens= 10 pens
cost of 3 books and 4 pens are Rs: 520
520/10=52
cost of one pen is 52.
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