121.

Three numbers are in the ratio 3 : 4 : 5. The sum of the largest and the smallest equals the sum of the second and 52. The smallest number is

• 20

• 27

• 39

• 52

If the radius of a circle is increased by 50%, its area is increased by

• 125%

• 100%

• 75%

• 50%

The value of  is

• 0

• 2.994

• 3.208

• 3

If a^1/3 = 11,  then the value of a² - 331 a is

• 1331331

• 1331000

• 1334331

• 1330030

A and B working separately can do a piece of work in 9 and 12 days respectively. If they work for a day alternately with A beginning, the work would be completed in

A and B together can do a work in 10 days. B and C together can do the same work in 6 days. A and C together can do the work in 12 days. Then A, B and C together can do the work in

• 28 days

• 14 days

• 

• 

A does half as much work as B in three-fourth of the time. If together they take 18 days to complete a work, how much time shall B take to do it alone?

• 30 days

• 35 days

• 40 days

• 45 days

If a wire is bent into the shape of a square, then the area of the square so formed 81 cm². When the wire is rebent into semicircular shape, then the area (in cm²) of the semi-circle will be 

• 22

• 44

• 77

• 154

Marbles of diameter 1.4 cm are dropped into a cylindrical beaker containing some water and are fully submerged. The diameter of the beaker is 7 cm. Find how many marbles have been dropped in it, if the water rises by 5.6 cm.

• 50

• 150

• 250

• 350

Water is flowing at the rate of 3 km/h through a circular pipe of 20 cm internal diameter into a circular cistern of diameter 10 m and depth 2 m. In how much time will the cistern be filled?

• 1 h

• 1 h 40 min

• 1 h 20 min

• 2 h 40 min