A bag contains ₹5 and ₹10 coins for a total of 40 coins and a total amount of ₹310. What is the difference between the amount made up of all ₹10 coins and the amount made up of all ₹5 coins?
Answer & explanation
Correct answer: option 4
Let no. of ₹5 coins = x
No. of ₹10 coins = 40 - x
Total amount = ₹310
5x + 10(40 - x) = 310
5x + 400 - 10x = 310
5x = 90 ⇒ x = 18
Amount in the form of ₹5 coins = 5x = 5 x 18 = ₹90
₹10 coins = 10(40 - x) = 10 x 22 = ₹220
Difference in these amounts -= ₹220 - ₹90 = ₹130