Quantitative Aptitude - Arithmetic Ability Questions

When a number is increased by 42, it becomes 121% of itself. What is the number?

Find the value of  x3 - y3, if x - y = 4 and xy = 12.

The sum of three consecutive natural numbers each divisible by 5, is 225. The largest among them is

Vinay professes to lose 4% on sugar and uses a weight of 620 gm instead of 1 kg. What is the total profit percentage?

ABCD is a quadrilateral in which BD and AC are diagonals then

35% of an alloy was silver. If in the quantity of alloy there was 119 g of silver, what was the quantity of the elements in the alloy?

In a Δ ABC, DE || BC. D and E lie on AB and AC respectively. If AB = 7 cm and BD = 3cm, then find BC:DE

A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?