book
Maths Puzzle
Numerical Ability
How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?
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book Other Question
The ages of the two brothers are in the ratio of 5:4. Four years ago their ages were in the ration of 11:8, find their present ages.
If the number of square units in the area of circle C is twice the number of linear units in the circumference of C, what is the number of square units in the area?
(A) 4
(B) 8
(C) 4π
(D) 8π
(E) 16π