8/9 × 15/28 × 21/25 = (8×15×21)/(9×28×25) = 2520/6300 = (2×1260)/(5×1260) = 2/5
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4/15 = 20/75 7/25 = 21/75 So, 7/25 is bigger.
Multiply it by 100 and so 15/25 times 100 = 60%
You would need to use 15 over 25.
15/25 is 60%
21⁄25 = 0.8421 over 25 to a decimal = 0.8421/25:= 21 ÷ 25= 0.84 in decimal