Four different electronic devices make a beep after every 30 minutes, 1 hour, 1½ hour and 1 hour 45 minutes, respectively. All these devices beeped together at 12 noon. They will again beep together at

Raman can do a piece of work in 16 days. Satish can do the same work in 8 days while Ashok can do it in 32 days. All of them worked together when they started, but Satish left after 2 days. Raman left 3 days before the completion of work. How long did it take to complete the enti…

Sudhir purchased a chair with three successive discounts of 20%, 12.5% and 5%. The equivalent single discount is:

Even after reducing the marked price of an item, by Rs. 32, a shopkeeper makes a profit of 15%. If the cost price is Rs. 320, what percentage of profit would he have made, if he had sold the item at the marked price?

In Kendriya Vidyalaya, Ujjain, 20 percent of students are athletes. In Navodaya Vidyalaya, Ujjain, 25 percent of students are athletes. If Navodaya Vidyalaya has 60% more students than Kendriya Vidyalaya, then the number of athletes in Navodaya Vidyalaya is what percent of the at…

Consider the following figures (I, II and III) and the statements (A, B, C and D) regarding them. Figure (I): rectangle 9 cm × 4 cm; Figure (II): square of side 6 cm; Figure (III): right-angled triangle with legs 9 cm and 8 cm. A. The areas of three figures are different B. The a…

Consider the following statements about numbers. A. There exists a smallest natural number. B. There exists a largest natural number. C. Every rational number is also a real number. D. Between two consecutive natural numbers, there is always a natural number. Choose the correct a…

If A + 1/(B + 1/(C − 9)) = 29/5, then the value of A + B + C, is

If height and radius of right circular cylinder are equal and its volume is 176/7 cm³, then its radius (= height) is