Quantitative Aptitude - Arithmetic Ability Questions

A group of boys has an average weight of 36 kg. One boy weighing 42 kg leaves the group and another boy weighing 30 kg joins the group. If the average now becomes 35.7 kg, then how many boys are there in the group?

What is the reflection of the point (4 , -3) in the line y = 1?

If 5x + 6(3-2x) = 4, then what is the value of x?

The sum of two positive integers is 80 & difference between them is 20. Then what is difference of squares of those numbers ?

Find the value of 200 x 20 x 2 x 0.2 x 0.02 x 0.002 = ?

The least number that must be subtracted from 1294 so that the remainder when divided by 9, 11, 13 will leave in each case the same remainder 6 is:

Two circles touch each other at point X. A common tangent touch them at two distinct points Y and Z. If another tangent passing through X cut YZ at A and XA= 16 cm, then what is the value (in cm) of YZ?

Find the roots of the quadratic equation 27x2 + 57x -­ 14 = 0