The average of a and b is 20. The average of a, b, c, and d is 25. What is the average of c and d?

Liushan CHEN asked Nov 3, 2022

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Liushan CHEN asked Nov 3, 2022

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13 votes

Answer:

Explanation:

The average of a and b is 20

total a and b = 20 * 2 = 40

The average of a, b, c, and d is 25

total a,b,c and d = 25 * 4 = 100

Total of c and d = 100 - 40 = 60

average of c and d = 60/2 = 30

Anas Naguib answered Nov 9, 2022

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