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 45 + 2 x 51 + 3 x 12
= 45 + 102 + 36
= 183
(b)
Number of children in families that have at least two children who have moved out
=
12 x (102 + 36)
=
12 x 138
= 69
Number of children left
= 183 - 69
= 114
Answer(s): (a) 183; (b) 114