51.

Find the least number which must be subtracted from 18265 to make it a perfect square.

• 30

• 38

• 40

• 45

A and B together can do a piece of work in 36 days, B and C together can do it in 24 days. A and C together can do it in 18 days. The three working together can finish the work in

• 8 days

• 16 days

• 30 days

• 32 days

Two adjacent sides of a parallelogram are 21 cm and 20 cm. The diagonal joining the end points of these two sides is 29 cm. The area of the parallelogram (in sq cm) is

• 240

• 120

• 210

• 420

A dealer marks his goods 20% above cost price. He then allows some discount on it and makes a profit of 8%. The rate of discount is

• 4%

• 6%

• 10%

• 12%

Sum of two numbers is thrice their difference. Their ratio is 

• 1 : 2

• 2 : 1

• 3 : 1

• 1 : 3

The average age of 36 students in a group is 14 years. When the teacher's age is included in it, the average increases by one. The teacher's age in years is

• 31 years

• 51 years

• 36 years

• 50 years

A dishonest dealer professes to sell his goods at cost price but uses a weight of 875 gm for the kilogram weight. His gain in percentage is

• 17%

• 

• 

• 14%

A's salary is 50% more than that of B. Then B's salary is less than that of A by:

• 50%

• 

• 

• 

Speed of a boat along and against the current are 14 km/hr and 8 km/hr respectively. The speed of the current is

• 11 km/hr

• 6 km/hr

• 5.5 km/hr

• 3 km/hr

If the simple interest on Rs 1/- for 1 month is 1 paisa, then the rate percent per annum will be:

• 10%

• 8%

• 12%

• 6%