What percentage of numbers from 1 to 70 has 1 or 9 in the unit's digit?

The ratio between the perimeter and the breadth of a rectangle is 5:1. If the area of the rectangle is 216 sq....

The average weight of 8 people increases by 2.5 kg when a new person comes in place of one of them weighting 6...

Mr.khan invested an amount of TK. 13,900 divided into two different schemes A and B at a simple interest rate...

A 3-digit number 4a3 is added to another 3-digit number 984 to give a 4- digit number 13b7, which is divisible...

How many times are the hands of a clock at right angle in a day?

The population of town increased from 1,75,000 to 2,62,500 in a decade. The average percentage increase of the...