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 79 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 23 + 2 x 39 + 3 x 19
= 23 + 78 + 57
= 158
(b)
Number of children in families that have at least two children who have moved out
=
79 x (78 + 57)
=
79 x 135
= 105
Number of children left
= 158 - 105
= 53
Answer(s): (a) 158; (b) 53