How many prime numbers are there from 20 to 90?
Find Missing number
In a class, 3/5 of the students are girls and rest are boys. If 2/9 of the girls and 1/4 of the boys are absent. What part of the total number of students are present?
$$(49)^{15}-1$$ is exactly divisible by :
one fourth of a tank holds 135 litres of water. What part of the tank is full if it contains 180 litres of water ?
Fraction between 2/5 and 4/9 is:
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