The average height of a group of 8 girls is 129 cm. When Rachel and Shannon left the group, the average height decreased by 4 cm. What is Rachel and Shannon's total height?
|
8 girls |
6 girls |
Number |
8 |
6 |
Value |
129 |
125 |
Total value |
1032 |
750 |
Total number of girls after 2 girls left the group
= 8 - 2
= 6
New average height after 2 girls left the group
= 129 - 4
= 125 cm
Total height of 8 girls
= 8 x 129
= 1032 cm
Total height of 6 girls
= 6 x 125
= 750 cm
Total height of Rachel and Shannon
= 1032 - 750
= 282 cm
Answer(s): 282 cm