Quantitative Aptitude - Arithmetic Ability Questions

If a - b = -5 and a2+b2=73, then find ab.

The marked price of a ceiling fan is Rs. 1200 and the shopkeeper allows a discount of 5 % on it. Then selling price of the fan is

P(3,1) and R(-7,5) are vertices of a rhombus PQRS. What is the equation of diagonal QS?

If the radius of a circle is increased by 21%, then its area will increase by what percent?

If 9x - [5(2x + 1)/2] = 9/2, then the value of x is?

If a2+b2+c2=83and a+b+c=15 then the value of ab+bc+ca is

The ratio of number of boys to the number of girls in a school of 432 pupils is 5 : 4. When some new boys and girls are admitted, the number of boys increase by 12 and the ratio of the boys to girls changes to 7 : 6. The number of new girls admitted is

There is a three digit number. The digit at the tenth place is 3. If the place of all the digits are replaced with each other symmetrically about the tens position,then the new number obtained is 396 more than the original three digit number. The sum of the digits at unit & hundredth place is 14. Find out the original number?