1.  If y = 5, then what is the value of 10yy3 - y2 ?


502
100
2005
500


Answer

 Option

10yy3 - y2 = 10 * 553 - 52 = 50 * 125 - 25 = 50 * 100 = 50 * 10 = 500.

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2.  If 1369 + .0615 + x = 37.25, then x is equal to :


10-1
10-2
10-3
None of these


Answer

 Option

37 + .0615 + x = 37.25. .0615 + x = 0.25. .0615 + x = (0.25)2 = 0.0625. x = .001 = 1103 = 10-3.

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3.  If x * y = x + y + xy, the value of 6 * 24 is :


41
42
43
44


Answer

 Option

6 * 24 = 6 + 24 + 6 * 24 = 30 + 144 = 30 + 12 = 42.

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4.  If x * y = x + y + xy, the value of 6 * 24 is :


41
42
43
44


Answer

 Option

6 * 24 = 6 + 24 + 6 * 24 = 30 + 144 = 30 + 12 = 42.

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5.  The square root of (2722 - 1282) is :


144
200
240
256


Answer

 Option

(272)2 - (128)2 = (272 + 128)(272 - 128) = 400 * 144 = 57600 = 240.

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