2/3 of a box of buttons are black, 1/12 of them are green and the rema – InterviewSolution

1.	2/3 of a box of buttons are black, 1/12 of them are green and the remainder are blue. If there are 21 blue buttons, how many buttons are there altogether?
Answer» 2/3 MEANS 8/12 so 8/12+1/12=9/12 remaing12/12 -9/12=3/12 3/12=21 then, 12/12=84

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