The average height of a group of 9 girls is 125 cm. When Fiona and Anna joined the group, the average height increased by 3 cm. What is Fiona and Anna's total height?
| |
9 girls |
11 girls |
| Number |
9 |
11 |
| Value |
125 |
128 |
| Total value |
1125 |
1408 |
Total number of girls after 2 more girls joined the group
= 9 + 2
= 11
New average height after 2 more girls joined the group
= 125 + 3
= 128 cm
Total height of 9 girls
= 9 x 125
= 1125 cm
Total height of 11 girls
= 11 x 128
= 1408 cm
Total height of Fiona and Anna
= 1408 - 1125
= 283 cm
Answer(s): 283 cm
