Oabcd is isosceles trapezium such that one angle is 2x and another 3x . find all angles

If g1 g2 g3 are geometric means between two numbers a and b find g1g2

Least number of five digits that is exactly divisible by 16 18 24 and 30

There were 99 students standing in a line. every 10th student from the beginning was given a school flag to hold. the third student is given a staff and there after every 10th student in given a staff. how many students are holding flags and how many are holding staff ?