A tap supplies water at 10°C and another tap at 100°C. How much hot water must be taken so that we get 20 kg water at 35°C?

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7.2 kg

10 kg

5.6 kg

14.4 kg

answer is C.

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Detailed Solution

m(100−35)×1=(20−m)(35−10)×1 or 65m=500−25m or 90m=500∴ m=50090≈5.6kg.

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