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Mohan needed to pay a shopkeeper a total of Rs. 70. He had only 1 rupee, 2 rupee and 5 rupee coins in the ratio 4 : 3 : 5. If instead of giving the shopkeeper 5 rupee coins, he paid him in 2 rupee coins. How much more should he have to pay the shopkeeper?

Mohan needed to pay a shopkeeper a total of Rs. 70. He had only 1 rupee, 2 rupee and 5 rupee coins in the ratio 4 : 3 : 5. If instead of giving the shopkeeper 5 rupee coins, he paid him in 2 rupee coins. How much more should he have to pay the shopkeeper? Correct Answer 30

Let the total number of coins be x

Total money to be paid = 1 × ((4/12) × x) + 2 × ((3/12) × x) + 5 × ((5/12) × x) = Rs. 70

⇒ x = 24

Actual money paid = 1 × ((4/12) × 24) + 2 × ((3/12) × 24) + 2 × ((5/12) × 24) = Rs. 40

Extra money to be paid = 70 – 40 = Rs. 30 

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