Bank Math

The average age of A, B and C is 30 years. If the difference between B’s age and A’s age is the same as the difference between C’s age and B’s age. If D is 40 years older than B then what is the sum of the age of B and D?

What is the probability that an integer selected at random from those between 20 and 100 inclusive is a multiple of 15?

The daily rate for a hotel room that sleeps 4 people is Tk. 390 for one person and X taka for each additional person. If 3 people take the room for one day and each pays Tk 210 for the room, then what is the value of X?

A man's age is now 3 times his son's age. Eight years back, the man's age was 5 times his son's age. What is the present age of the son?

A takes twice as much times as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in.

The difference between the two numbers is 11 and one-fifth of their sum is 9. Find the numbers.

If a square mirror has a 20 inch diagonal, what is the approximate perimeter of the mirror, in inches?

7 is added to a certain number; the sum is multiplied by 5, the product is divided by 9 and 3 is subtracted from the quotient. The remainder left is 12. The number is:

Rahim invested in all Tk. 2,600 in three different schemes at 8%, 4% and 6% per annum simple interest. At the end of the year, he received the same interest in all the three schemes. What is the money invested in scheme having 4% rate of interest?

(10)² is how many times of (0.01)³?

Out of 7,500 applications for a recruitment test, 1,500 failed to appear for the test. What percent of the total applicants did appear for the test?

A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is:

Compound interest on a certain sum at the rate of 12% per annum after 2 years is Tk. 1,42,464. Find the simple interest on that sum at the rate of 15% per annum for 7 years.

A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased 8 times, how many days will it take for both of them to finish the work if they work together?

The cost of renting a small bus for a trip was Taka X which was to be shared equally by 16 persons. Actually 10 persons availed the trip. How much more Taka will be the cost per person?

A tap can fill a tank in 6 hours. After half the tank is filled another similar tap is opened. What is the total time taken to fill the tank completely?

A milkman purchases the milk at Tk. x per liter and sells it a Tk. 2x per liter still he mixes 2 Iiters water with every 6 liters of pure milk. What is the profit percentage?

If a carton containing a dozen mirrors is dropped. which of the following cannot be the ratio of broken mirrors to unbroken mirrors?

A Triangle has a perimeter 13. The two shorter sides have integer lengths equal to x and x + 1. Which of the following could be the length of the other side?

The price of raw materials has gone up by 15%, labor cost has also increased from 25% of the cost of raw material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?