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 12 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 38 + 2 x 42 + 3 x 32
= 38 + 84 + 96
= 218
(b)
Number of children in families that have at least two children who have moved out
=
12 x (84 + 96)
=
12 x 180
= 90
Number of children left
= 218 - 90
= 128
Answer(s): (a) 218; (b) 128