The average height of a group of 6 girls is 107 cm. When Kathy and Zara left the group, the average height decreased by 4 cm. What is Kathy and Zara's total height?
| |
6 girls |
4 girls |
| Number |
6 |
4 |
| Value |
107 |
103 |
| Total value |
642 |
412 |
Total number of girls after 2 girls left the group
= 6 - 2
= 4
New average height after 2 girls left the group
= 107 - 4
= 103 cm
Total height of 6 girls
= 6 x 107
= 642 cm
Total height of 4 girls
= 4 x 103
= 412 cm
Total height of Kathy and Zara
= 642 - 412
= 230 cm
Answer(s): 230 cm
