Question

there are 100 coins in a bag. some are 20p coins and rest are 50p coins. the total value Is rs 32.find the total no. of 20p coins in the bag

Answer 1

let the total no. of 20p coins be x
total number of coins = 100
therefore, no. of 50p coins = 100-x
total value = rs. 32
= 3200p
according to given condition,
20x + 50(100-x) = 3200
20x + 5000 - 50x = 3200
-30x = 3200-5000
-30x = -1800
x = -1800/-30
x = 1800/30
x = 180/3
x = 60

therefore, total no. of 20p coins in the bag=60

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