There are a total of 160 children in Years 4, 5 and 6 31 of these children cannot swim.
15 children in Year 4 cannot swim.
43 children in Year 5 can swim.
There are 52 children in Year 6
50 of these 52 children can swim.
(i) Work out the number of children in Year 4 who can swim.

If square root x = -7, then x= -49 true or false

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?