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 57 + 2 x 21 + 3 x 18
= 57 + 42 + 54
= 153
(b)
Number of children in families that have at least two children who have moved out
=
12 x (42 + 54)
=
12 x 96
= 48
Number of children left
= 153 - 48
= 105
Answer(s): (a) 153; (b) 105