Q&Answers: Math/Chemistry/Physics Problems + Solutions

If x and y are positive integers and 7 + x + y + xy = 21, what is the value of x + y?

What is greatest positive integer n such that 2^n is a factor of 12^12?

A river 7m deep and 75 m wide is flowing at the rate of 4 kmph the amount of water that runs into the sea per minute is?

Express 20 mps in kmph?

Five different books (A, B, C, D and E) are to be arranged on a shelf.

Mike buys 3 cartons of eggs at the store.

24 buses are running between two places P and Q.

3 candidates in an election and received 5136, 7636 and 11628 votes respectively.

A teacher gave the same test to three history classes: A, B, and C.

4400÷22÷10=?

If X is the sum of first 100 positive even integers and Y is the sum of first 100 positive odd integers, what is the value of x-y?

A car covers a distance of 640 km in 5 hours.

Rs. 800 becomes Rs. 956 in 3 years at a certain rate of simple interest.

A rectangular lawn of length 200m by 120m has two roads running along its center, one along the length and the other along the width.

Pipe A can fill a tank in 32 minutes.

The average age of three boys is 20 years and their ages are in proportion 3:5:7.

If x is less than y by 25% then y exceed x by:

The ratio 2 : 3 expressed as a percent equals

Twenty percent of the women in a college class are science majors, and the non-science majors make up 60% of the class.

The average student age of a certain class which has 30 students is 10.

A car covers a distance of 624 km in 3 1/5 hours.

Calculate the speed of a boat in still water (in km/hr) if in one hour, the boat goes 10 km/hr downstream and 4 km/hr upstream.

A number increased by 20% gives 1080.

In a restaurant, the profit is 150% of the cost.