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 51 + 2 x 15 + 3 x 12
= 51 + 30 + 36
= 117
(b)
Number of children in families that have at least two children who have moved out
=
12 x (30 + 36)
=
12 x 66
= 33
Number of children left
= 117 - 33
= 84
Answer(s): (a) 117; (b) 84