The dimensions of the tank are 50 cm by 32 cm by 20 cm. The tank is full of water and sand.
The ratio of the volume of water to the volume of sand is 5:1
Work out the number of litres of water in the tank.

The wheels of a bicycle have a diameter of 70cm. how many meters will the bicycle travel if each wheel makes 50 revolutions

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?