Question

Look at this riddle?
If she answers the riddle correctly how ever will she pay for the pencils?

Answer 1

Let, the cost of one pencil be ₹ x.

Now, the 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 the cost of 5 pencils.

Therefore, we get the following equation

7x – 5x = 6

⇒ 2x = 6

⇒ `(2x)/2 = 6/2`  ...[Dividing both sides by 2]

⇒ x = 3

Since, the cost of one pencil is ₹ 3.

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

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