A group of 20 people pay a total of £20 to see an exhibition. The admission price is £3 for men, £2 for women and 50p for children. How many men, women and children are there in the group?
Three circular medallions fit in a rectangular box. Can you find the radius of the largest one?
Is the mean of the squares of two numbers greater than, or less
than, the square of their means?