Watermelon made of pulp and water contains 90% water. After being dried up for some hours it contains 40% water. If the present weight is 20 kg. What was the original weight? A. 110 B. 120 C. 130 D. 150
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Let original weight = x kg
Original weight of water = 0.9x
(0.9x-10)/(x-10) = 0.8
0.9x-10 = 0.8x-8
0.1x = 2
x = 20 kg
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