Average
Algebra
Level
1
The average stickers of Alice and Betty was 2600.The average stickers Betty and Kelly was 4300.If the average stickers of Alice and Kelly was 2700,find the average stickers of Alice,Betty and Kelly.
The answer is 3200.
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1 solution
A + B = 2 * 2600 = 5200
A + k = 2 * 2700 = 5400
B + k = 2 * 4300 = 8600
2A + 2B + 2k = 19200
A + B + K = 9600
Average stickers of each = 9600/3 = 3200