Three tanks, a,b, c are used to store oil. tank a contains 'n' litres of oil. tank b contains (n+150) litres of oil. tank c is empty. oil is pumped from tank a and from tank b into tank c so that all three tanks contain the same amount of oil. 500 litres of oil are pumped from tank a into tank c. work out the value of 'n'.

Calculate the density of benzene if 300ml of it weighs 263g. a. 0.88 g/ml b. 1.14 g/ml c. 78,900 g/ml d. 37 g/ml

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?