A large cube is formed from the material obtained by melting three smaller cubes of 3,4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?

Two trains of the same length running in opposite directions cross a man standing on the platform in 27 second...

From a group of 7 men and 6 women, five persons are to be selected to form a committee so that at least 3 men...

Three numbers which are co-prime to each other are such that the product of the first two is 551 and that of t...

The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is t...

X, Y and Z jointly started a business. It was agreed that X would invest Tk 6,500 for 6 months, Y, Tk 8,400 fo...

Let N be the greatest number that will divide 1305, 4665 and 6905, leaving the same remainder in each case. Th...