The average height of a group of 8 girls is 137 cm. When Hilda and Barbara joined the group, the average height increased by 10 cm. What is Hilda and Barbara's total height?
| |
8 girls |
10 girls |
| Number |
8 |
10 |
| Value |
137 |
147 |
| Total value |
1096 |
1470 |
Total number of girls after 2 more girls joined the group
= 8 + 2
= 10
New average height after 2 more girls joined the group
= 137 + 10
= 147 cm
Total height of 8 girls
= 8 x 137
= 1096 cm
Total height of 10 girls
= 10 x 147
= 1470 cm
Total height of Hilda and Barbara
= 1470 - 1096
= 374 cm
Answer(s): 374 cm
