Quantitative Aptitude - Arithmetic Ability Questions

The price of an article is cut by 36%, to restore to its original value, the new price must be increased by

A Number is increased by 20%. To get back to the orignal number, the increased number is to be reduced by

If a(a + b + c) = 45, b(a + b + c) = 75 and c(a + b + c) = 105, then what is the value of (a2 + b2 + c2 )?

What is the value of [(tan 5θ + tan 3θ)/4 cos 4θ (tan 5θ – tan 3θ)]?

What is the unit place digit in the expansion of  773?

The circumference of a circle is 88 cm, find its area?

If x = 1 – y and x2 = 2 – y2, then what is the value of xy?

A can do a piece of work in 18 days. He worked at it for 12 days and B finished the remaining work in 8 days. B alone can do the whole work in