20% raise of price followed by a discount of 25% of the raised portion will

• increase the price by 10%

• decrease the price by 5%

• increases the price by 15%

• increases the price by 15%

112.

The sum of the ages of two brothers, having a difference of 8yr between them, will double after 10 yr. What is the ratio of the age of the younger brother to that of the elder brother?

• 7 : 11

• 3 : 7

• 8 : 9 

• 8 : 9 

The ratio of two numbers is 3 : 4 and their LCM is 180. The second number is

• 60

• 45

• 90

• 90

Out of 30 teachers of a school, a teacher of age of 60 yr retired. In his place another teacher of age 30 yr was appointed. As a result, the mean age of the teacher will

• decrease by 6 months

• decrease by 1 yr

• remain same

• remain same

Average age of A, B and C is 84 yr. When D joins them the average age becomes 80 yr. A new person E, whose age is 4 yr more than D, replaces A and the average of B, C, D and E becomes 78 yr. What is the age of A?

• 60 yr

• 70 yr

• 80 yr

• 50 yr

By selling an article for ₹ 450, a man loses 10%. The gain or loss per cent if he sells it for ₹ 540 is

• loss 8%

• gain 9%

• loss 9%

• loss 9%

A man loses  of his money and after spending 80% of the remainder, he is left with ₹ 159. How much did he have at first?

• ₹ 500

• ₹ 800

• ₹ 1000

• ₹ 1000

A gun is fired at a distance of 1.34 km from Geeta. She hears the sound after 4 s. The speed at which sound travels is

• 335 m/s

• 330 m/s

• 300 m/s

• 300 m/s

If I walk at 5km/h, I miss a train by 7 min. However, if I walk at 6 km/h I reach the station 5 min before the departure of the train. The distance between my house and the station is

• 6.5 km

• 7 km

• 6 km

• 6 km

The compound interest on ₹ 1800 at 10% per annum for a certain period of time is ₹ 378. Find the time (in yr).

• 2.8

• 3.0

• 2.5

• 2.5