Quantitative Aptitude - Arithmetic Ability Questions

If a-b=1 and a3-b3 = 61, then the value of ab will be

90% of X = 40% of Y and Y = a% of X. What is the value of a?

If a3 + b3 = 28 and a + b = 4, then what is the value of ab?

Kamal has some apples. He sold 40% more than he ate. If he sold 70 apples, how many did he eat?

A mason can build a wall in 70 hours. After 7 hours he takes a break. What fraction of the wall is yet to be built?

If a dairy mixes cow's milk which contains 10% fat with buffalo's milk which contains 20% fat, then the resulting mixture has fat (120/7)% of fat. What ratio was the cow's milk mixed with buffalo's milk?

The number 3521is divided by 8. What is the remainder?

In a triangle the length of the side opposite the angle which measures 30 degree is 12 cm, what is the length of the side opposite to the angle which measures 60 degree?