Q100 of 107 Page 104

Look at this riddle?

If she answers the riddle correctly however will she pay for the pencils?


Let the cost of one pencil be ₹x.


Now, cost of such 7 pencils will be ₹7x and of 5 pencils will be ₹5x.


It is given that cost of 7 pencils is ₹6 more than cost of 5 pencils. Therefore, we get the following equation


7x – 5x = 6


⇒ 2x = 6


⇒ [dividing both sides by 2]


⇒ x = 3


Since, cost of one pencil is ₹3.


So, the cost of 10 pencils = 3 × 10 = ₹30.


Thus, she has to pay ₹30 for 10 pencils.



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