SHARP BRAIN

The average age of 30 boys in a class is equal to 14 years. When the age of the class teacher is included the average becomes 15 years. Find the age of the class teacher?

• A. 45

• B. 42

• C. 50

• D. 44

The average of 11 numbers is 10.9. If the average of the first six is 10.5 and that of the last six is 11.4 the sixth number is?

• A. 11.4

• B. 11.5

• C. 11.0

• D. 11.3

A shop dealer makes his goods 25% above CP and then while selling gives a discount of 12% on MP. Find his profit % ?

• A. 15%

• B. 12%

• C. 11%

• D. 10%

A and B rent a pasture for 10 months. A put in 80 cows for 7 months. How many can B put in for the remaining 3 months, if he pays half as much again as A?

• A. 120

  
  

• B. 280

• C. 180

• D. 200

Rama Krishna can finish a work in 20 days and Suresh in 25 days. They both work together for 5 days and then Suresh goes away. In how many days will Rama Krishna complete the remaining work?

• A. 10 days

• B. 11 days

• C. 8 days

• D. 9 days

If P can do a work in 6 days and Q can do the same work in 8 days. If R who can do the same work in 12 days, joins them, then the work will be completed in how many days?

• A. 7/3 days

• B. 8/3 days

• C. 10/3 days

• D. 11/3 days

5 men and 10 boys can do a piece of work in 30 days and 8 men and 12 boys can do the work in 20 days then the ratio of daily work done by a man to that of the boy.

• A. 6:1

• B. 7:3

• C. 4:5

• D. 5:1

A man spends 60% of his income. His income is increased by 20% and his expenditure also increases by 10%. Find the percentage decrease in his saving?

• A. 15%

• B. 20%

• C. 25%

• D. 10%

Rani mixes 70kg of sugar worth Rs.28.50 per kg with 100kg of sugar worth Rs.30.50 per kg. At what rate shall he sell the mixture to gain 10 %?

• A. Rs.29.75

• B. Rs.32.64

• C. Rs.31.50

• D. Rs.30.46

How much water must be added to a bucket which contains 40 liters of milk at the cost price of Rs.3.50 per liter so that the cost of milk reduces to Rs.2 per liter?

• A. 25 liters

• B. 28 liters

• C. 30 liters

• D. 35 liters