book
Maths Puzzle
Numerical Ability
12
______
r + 4
________
11
_______
6r + 24
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book Other Question
A contractor mixed two batches of concrete that were 9.3 and 11.3 percent cement to obtain 4500 lb of concrete that was 10.8 percent cement. How many pounds of each type of concrete was used?
solve for x
1/x-5 + 1/x-12 = 1/x-17x+60