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80% of 30 = 24 24/30 = 0.80 CHECK: 10% of 30 = 3 80% is 8 times as much, so 3 x 8 DOES = 24
The answer is 30 24 = 4/5 * X 24 * 5/4 = X 6 * 5 = X X = 30
24 = 2 x 2 x 2 x 3 30 = 2 x 3 x 5
24 4/5 x 30 = 24
24/30 = x/100 cross-multiply: 30x = 2400 divide by 30: x = 80 Answer is 80%