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There is a batch of cement on the construction site. 30% of the total cement is used in the first time and 60 tons are used in the second time. This is the remaining two fifths. How many tons of cement are left?
Let X be the total
0.3X+60+0.4X=X
X = 200 tons
There are two piles of cement a and B. the number of bags in pile a is 2 / 3 of that in pile B. If 140 bags are taken out of pile B and put into pile a, this is 1 / 4 of the total number of bags in pile B. how many bags of cement are there in pile B now
100 bags
A=(2/3)B
(B-140)/(A+B)=1/4
B = 240
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