Aptitude Tests 4 Me

Basic Numeracy/Quantitative Aptitude

Detailed Solution

182. a: We have to rearrange the equation to make R the subject.
Start by cross multiplying by (r + R); V (r + R) = 12R
Multiply out the bracket Vr + VR = 12R
Subtract VR from both sides (to collect 'R' terms on the same side): Vr = 12R - VR
Next put 'R' outside a bracket: Vr = R(12-V)
Finally divide both sides by (12-V): the answer is that R is equal to Vr/(12-V)

183. d: 0.127 expressed as a fraction = 127/1000
1/8 can also be expressed as (1 x 125) / (8 x 125) = 125/1000
The difference is 2/1000, which is 1/500

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187. d: The best approach is to pick a number that satisfies the rules that x and y are greater than 0. So for example you could choose 25 for y.
The value of x before doubling is then 25 - 50/25 = 23
The value after doubling y will be 50 - 50/50 = 49, which is more than double.

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