31.5
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18
0.1217
378
5/12 of 378 is found by multiplication. You multiply 378 by 5 then divide by 12. So the first step gives us 1890 and then when we divide we have 315/2 which is 13.125. It sometimes helps to not multiply such big numbers. You might note that 378 divided by 12 is 63/2, then we just need to multiply 63x5 which is 315.
378 divided by 9 = 42