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

A coin is flipped twice.What is the probability that both flips result in heads given that first flip does?

A shopkeeper sold an book offering a discount of 5% and earned a profit of 33%.

A number exceeds by 15 from its 3/8 part.

A 300 m long train crosses a platform in 39 sec while it crosses a signal pole in 14 sec.

Circles X and Y are concentric.

From the beginning to the end of 2007, the price of a stock rose 20 percent.

How many Kg of rice at Rs.6.60 per Kg. be mixed with 56Kg of rice at Rs.9.60 per Kg to get a mixture

Out of first 20 natural numbers, one number is selected at random.

A one-foot stick is marked in 1/2 and 1/4 portion.

Find a two digit number, given that the sum of the digits is 13 and the difference of the digits is 5.?

john bought a computer for \$2,000 and then paid a 5 percent sales tax, and Henry bought a computer for \$1,800 and then paid a 12 percent sales tax.

In how many ways can 5 boys and 2girls be arranged ata table if 2 girls are never together?

When working alone, painter W can paint a room in 2 hours, and working alone, painter X can paint the same room in h hours.

The L.C.M. of 2 numbers is 54.

Set A contains all the even numbers between 22 and 70 inclusive.

Rahul's Mathematics test had 75 problems, 10 arithmetic, 30 algebra, 35 geometry problems.

If ABC is a quarter circle and a smaller circle is inscribed in it; if radius of quarter circle is 1.414units.

N is a positive integer.

Two isosceles Triangles have equal vertical angles and their areas are in the ratio 25:49.

On dividing a number by 7, we get 3 as quotient and 0 as remainder.