# Aptitude:: Surds and Indices

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### Exercise

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11

#### If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:

 A. 0 B. 2 C. 4 D. 6

12

#### If 5a = 3125, then the value of 5(a - 3) is:

 A. 25 B. 125 C. 625 D. 1625

13

#### Given that 100.48= x, 100.70 = y and xz = y2, then the value of z is close to:

 A. 1.45 B. 1.88 C. 2.9 D. 3.7

14

#### then the value of x is:

 A. $\frac{1}{2}$ B. 1 C. 2 D. $\frac{7}{2}$

15

#### (17)3.5 x (17)? = 178

 A. 2.29 B. 2.75 C. 4.25 D. 4.5

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