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13. 12 litres of water a poured into an aquarium of dimensions 1250px length , 750px breadth, and 40 cm height. How high (in cm) will the water rise?

 (1 litre = 25000px3)

　　A. 6

　　B. 8

　　C. 10

　　D. 20

　　E. 40

Correct Answer: B

Explanation:

Total volume of water = 12 liters = 12 x 1000 cm3. The base of the aquarium is 50 x 30 = 37500px3. Base of tank x height of water = volume of water. 1500 x height = 12000; height = 12000 / 1500 = 8

14. Six years ago Anita was P times as old as Ben was. If Anita is now 17 years old, how old is Ben now in terms of P ?

　　A. 11/P + 6

　　B. P/11 +6

　　C. 17 - P/6

　　D. 17/P

　　E. 11.5P

Correct Answer: A

Explanation:

Let Ben’s age now be B. Anita’s age now is A. (A - 6) = P(B - 6)

But A is 17 and therefore 11 = P(B - 6). 11/P = B-6

(11/P) + 6 = B

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