The graph shows the number of families and the number of children in each family in a block of flats.
- How many children are there in the whole block of flats?
- If 25 of the families who have at least two children move out of the block of flats, how many children are there left in the block of flats?
(a)
Number of children
= 1 x 18 + 2 x 51 + 3 x 26
= 18 + 102 + 78
= 198
(b)
Number of children in families that have at least two children who have moved out
=
25 x (102 + 78)
=
25 x 180
= 72
Number of children left
= 198 - 72
= 126
Answer(s): (a) 198; (b) 126