31.5 (get 1/10 of 840, then get 3/4 of that, then get 1/2 of that)
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Three quarters of 840 is calculated by multiplying 840 by 3/4, which is equivalent to 0.75. This can be done by multiplying 840 by 0.75, resulting in 630. Therefore, three quarters of 840 is 630.
630
15, 840
25% is a quarter of 840: 840 ÷ 4 = 210
Three of them: 840, 896, and 952.