137.

A and B together can do a piece of work in 6 days. If A can alone do the work in 18 days, then the number of days required for B to finish the work is

• 9

• 10

• 12

• 15

The maximum value of sin⁴ θ + cos⁴ θ is

• 2

• 1

• 3

• 

A shopkeeper bought 30 kg of rice at the rate of ₹ 70 per kg and 20 per kg of rice at the rate of ₹ 70.75 per kg. If he mixed the two brand of ice and sold the mixture of ₹ 80.50 per kg, his gain is

• ₹ 485

• ₹ 525

• ₹ 450

• ₹ 510

The sides of a triangle having area 7776 sq cm are in the ratio 3 : 4 : 5. The Perimeter of the triangle is

• 412 cm

• 424 cm

• 400 cm

• 432 cm

The sum of the four number is 48. When 5  and 1 are added to the first two and 3 and 7 are subtracted from the 3rd and 4th, the numbers will be equal. The numbers are

• 6, 10, 14, 18

• 5, 11, 13, 19

• 9, 7, 15, 17

• 4, 12, 12, 20

A 10 m long ladder is placed against a wall. It is inclined at an angle of 30° at the ground. The distance (in m) of the foot of the ladder from the wall is  

• 7.32

• 8.66

• 8.16

• 8.26

The average weight of 15 oarsmen in a boat is increased by 1.6 kg when one of the crew who weighs 42 kg is replaced by a new man. Find the weight of the new man (in kg).

• 67

• 43

• 66

• 65

A tangent is drawn to a circle of radius 6 cm from a point situated at a distance of 10 cm from the centre of the circle. The length of the tangent will be

• 7 cm

• 4 cm

• 8 cm

• 5 cm

The numerical value of 

A pipe can fill a tank in x h and another can empty it in y h. They can together fill it in (y > x)

• x - y

• 

• y - x

•