Each box has the same number of soaps. A quarter of all boxes contain only white soaps, and in each of the remaining 120 boxes there are always half the white soaps and half the green. White soaps total 1200.

(a) the number of all soap boxes;
(b) the smallest number of boxes in which all white soaps should be inserted;
(c) the number of all soaps.
d) How many are green soaps?

Correct result:

k =  160
b =  100
t =  1920
z =  720


1/4k+120=k 0.75k=120 34k=120 3k=480 k=480/3=160 =160
1200=k/4 l+120/2 l l=1200/(k/4+60)=1200/(160/4+60)=12  b=1200/l=1200/12=100
t=k l=160 12=1920

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