when a certain number is divided by 7, the remainder is 0. if the remainder is not 0 when the number is divided by 14, then the remainder must be __

A mixture of 20 sprit and water contains 10% water. How much water must be added to this mixture to raise the...

How much interest will Tk. 1000 earn in one year at an annual interest rate of 20% if interest rate is compoun...

If x and y are consecutive positive integers which of the following must be an even integer?

A gardrn of 100 m length and 60 m width has a walkway of 2 m width hon every side. what is the area of the are...

An article when sold at a gain of 5% yields Tk. 15 more than when sold at a loss of 5%. Its cost price would b...