A teacher measures the heights of 9 students in her class as follows (in centimetres) 123 , 111 , 137 , 138 , 134 , 143 , 137 , 123 , 139 What is the median of their heights?

A solution of sugar and water contains 20% salt by weight. Of it 50 kg. water evaporates and the solution now contains 30% of sugar. Find the original quantity of solution.

The parking lot of the Mall has a capacity of 1998 cars. On Thursdays the ratio of occupied spots to empty spots in the parking lot was 13:24. The number of additional cars that could park there is

An integer is divided by 9 giving a remainder of 3. The resulting quotient when divided by 6 gives a remainder of 4. The resulting quotient is then divided by 7 giving a quotient of 1 and a remainder of 3. What will the finale remainder be if the order of the divisors is reversed?

A gymnasium weighs all the people that come in to exercise. On one morning, it notes down the weights of 7 people in kgs as follows 61 kgs, 80.1 kgs, 73 kgs, 62 kgs, 61 kgs, 80 kgs, 72.9 kgs The average of their weights is calculated. If a new person now comes in to exercise, and the new average is calculated to be 70.8, then what was the weight of the new person in kgs?