If r=3z and 9z=6y, then r=?

A two-digit number has 6 in its unit digit. The sum of its digits is one-fourth of the number itself. What is...

Mr. Jamal employed 50 workers to finish a work within 30 days. After 20 days he found out that only 50% of the...

Arif incurred a loss of 25% by selling a used mobile phone set at taka 1500. How much could he gain/lose by se...

60% of the students of a college are male. 60% of the males in the college speak French and 40% of the student...

which of the following fractions is smaller than 8/9 and greater than 2/5?

There are 87 balls in a jar. Each ball is painted with at least one of two colors, red or green. It is observe...