A sum of Rs 6.40 is made up of 80 coins which are either 10 paise or 5 paise coins. How many are coins of 5 paise?
Answer & explanation
Correct answer: option 4
Average per coin = \(\frac{640\;paise.}{80}\) = 8 paise
⇒ 5R = 80 (given)
⇒ 1R = 16
⇒ No. of 5p coins = 2R = 2 × 16 = 32