In his pocket , a boy has 3 red marbles , 4 blue marbles , and 4 green marbles , How many marbles will he have to take out of his pocket to ensure that he has taken out at least one of each colour?

The electric company charges Tk. 0.30 per kilowatt -hour (KWH). Rahim used 28000 KWH in April , 32 00 KWH in M...

A ferry can carry 24 buses or 36 cars at a time , If there are 18 buses on the ferry . how many cars can be lo...

If r = 5z and 15 z = 3y , then r =?

If the value of X and Y in the fraction XZ/Y are both tripled , how does the value of the fraction change ?

which of the following fractions is the equivalent of 0.5% ?

In the last week of a month , a car dealer sold 12 cars .A new sales promotion came out the first week of the...