141.

What is the area of the triangle bounded by the lines y = 2x, y = -2x and y = 6?

• 36

• 18

• 12

• 24

Three volumes of a Hindi book, identical in shape and size, are next to each other in a shelf, all upright, so that their spines are visible, left to right: I, II and III. A worm starts eating from the outside front cover of the volume I, and eats its way horizontally to the outside back cover of volume III. What is the distance travelled by the worm, if each volume is 6 cm thick?

• 6 cm

• 12 cm

• 18 cm

• a little more than 18 cm.

A cubical piece of wood was filed to make it into the largest possible sphere. What fraction of the original volume was removed?

• More than 3/4

• 1/2

• Slightly less than 1/2

• Slightly more than 1/2

Every month the price of a particular commodity falls in this order:

1024, 640, 400, 250, ....

What is the next value?

• 156.25

• Approximately 39

• 64

• 40

We define a function f(N) = sum of digits of N, expressed as decimal number. e.g. f(137) = 1 + 3 + 7 = 11. Evaluate f(2⁷3⁵5⁶).

• 10

• 18

• 28

• 11