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Question

If ₹300 is sufficient for two people, by what ratio should that amount be increased to make it sufficient for 5 people? Solve without calculating the increased amount.

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Solution

Let each person needs x amount.
Amount 2 people would need = 2x
Amount 5 people would need = 5x

Given 300 (=2x) is enough for 2 people.
HOOK: By what ratio, 2x must increase by to give 5x.
Now 2x needs to be increased in the ratio 2:5 to give 5x.
=> ₹ 300 must increase in the ratio 2:5.

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