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Answer : D

Explanation:

Let T = Total number of cards he had originally
Before Brian gave out any card, he had 100%
He gave out 20% to Scott --- So Brian is left with 80%
He gave out 15% to Adams --- Brian is left with 65%
65% represents 520 Cards
Therefore 65/100 x T = 520
0.65% x T = 520
X = 520/0.65
X = 800
He had 800 cards before he started sharing

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Answer : C

Explanation:

Let T = Total
S = Spanish
F = French
N(T) = N(S)only + N(S&F)only + N(F) + N(S&F)neither
410 = (240-x) + x + 180-x + 25
410 = 445 – x
X = 445 – 410
X = 35 (C)

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Answer : B

Explanation:

Logic: More boys will shovel the driveway in less time.
Therefore: Boys is inversely proportional to Time (Boys α 1/Time)
Let B = Boys
Let T = Time
Boys α 1/Time. Insert your constant
B = K/T
4 = K/2
K = 4 x 2 = 8
Therefore for 5 boys you will have 5 = 8/T
T = 8/5 hours
In Minutes = 8/5 x60 = 96 (B)
 

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Answer : A

Explanation:

The Rate = Pages/Minutes = 24/15 = X/40
15X = 24 x 40
X = 960/15
X = 64 pages (A)

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Answer : B

Explanation:

Represent Adam with A
Represent Judy with J
Judy now is twice as old as Adam J = 2A
Six years ago J-6 = 5(A-6)
Therefore, J-6 = 5A – 30
J-6 = 5(J/2) – 30
Multiply through by 2
2(J-6) = 5J-60
2J-12 = 5J-60
-12+60 = 5J-60
48 = 3J
J = 48/3
J = 16 (B)