The average height of a group of 6 girls is 103 cm. When Linda and Gem joined the group, the average height increased by 9 cm. What is Linda and Gem's total height?
| |
6 girls |
8 girls |
| Number |
6 |
8 |
| Value |
103 |
112 |
| Total value |
618 |
896 |
Total number of girls after 2 more girls joined the group
= 6 + 2
= 8
New average height after 2 more girls joined the group
= 103 + 9
= 112 cm
Total height of 6 girls
= 6 x 103
= 618 cm
Total height of 8 girls
= 8 x 112
= 896 cm
Total height of Linda and Gem
= 896 - 618
= 278 cm
Answer(s): 278 cm
