Quantitative Aptitude - Arithmetic Ability Questions

Simplify: (213 x 213 + 187 x 187)

1 packet of biscuits costs Rs 16 but a pack of 4 of the same packet of biscuits costs Rs 56. What is the effective discount (in %) on the pack?

A ladder is resting against a vertical wall and its bottom is 2.5 m away from the wall. If it slips 0.8 m down the wall, then its bottom will move away from the wall by 1.4 m. What is the length of the ladder?

A man sells an article at 15% profit. If he had sold it for . 6 more, he would have gained 18%. The man bought the article for

Two cars A and B travel from one city to another city, at speeds of 60 km/hr and 108 km/hr respectively. If car B takes 2 hours lesser time than car A for the journey, then what is the distance (in km) between the two cities?

If 70% of total articles are sold at a profit of 20% and remaining articles are sold at a loss of 20%, then what will be the overall profit percentage?

A complete factorisation of x4 + 64 is

If xy = -30 and x2 + y2 = 61, then find the value of (x + y).