Mathematics Past Questions and Answers

Working 5 hours a day, A can Complete a work in 8 days and working 6 hours a day, B can complete the same work in 10 days. Working 8 hours a day, they can jointly complete the work in how many days?

A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective is

A mixture of 40 liters of milk and water contains \(10 \%\) water. How much water should be added to this so that water may be \(20 \%\) in the new mixture?

Four different electronic devices make a beep after every 30 minutes, 1 hour, \(3 / 2\) hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at ____________

In a \(100 \mathrm{~m}\) race, A can beat B by \(25 \mathrm{~m}\) and \(B\) can beat \(C\) by \(4 \mathrm{~m}\). In the same race, A can beat \(C\) by?