Quantitative Aptitude - Arithmetic Ability Questions

Which of the following quadratic equations has equal roots?

The lengths of the two diagonals of a rhombus are 8 cm and 15 cm respectively. Find its area (in cm²).

The income of P, Q and R are in the ratio of 5 : 4 : 3 respectively and their expenses are in the ratio of 6 : 5 : 4 respectively. If P saves Rs 4000 out of an income of Rs 10000, then what will be the saving (in Rs) of Q?

There are a total of 200 students in a school, of which 7/10th are boys. Find the number of girls in the school.

Which of the following is the largest number among 2, 33, 4, 53

A regular hexagonal base prism has height 8 cm and side of base is 4 cm. What is the total surface area (in cm2) of the prism?

A, B and C can do a job working alone in 12, 16 and 24 days respectively. In how many days they can do the job if they worked together?

ΔPQR is right angled at Q. If tanP = 24/7, then what is the value of cosR ?