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 54 + 2 x 17 + 3 x 27
= 54 + 34 + 81
= 169
(b)
Number of children in families that have at least two children who have moved out
=
25 x (34 + 81)
=
25 x 115
= 46
Number of children left
= 169 - 46
= 123
Answer(s): (a) 169; (b) 123