The average height of a group of 5 girls is 147 cm. When Esther and Joelle joined the group, the average height increased by 4 cm. What is Esther and Joelle's total height?
|
5 girls |
7 girls |
Number |
5 |
7 |
Value |
147 |
151 |
Total value |
735 |
1057 |
Total number of girls after 2 more girls joined the group
= 5 + 2
= 7
New average height after 2 more girls joined the group
= 147 + 4
= 151 cm
Total height of 5 girls
= 5 x 147
= 735 cm
Total height of 7 girls
= 7 x 151
= 1057 cm
Total height of Esther and Joelle
= 1057 - 735
= 322 cm
Answer(s): 322 cm