A , b , c and d are different positive numbers. The average (arithmetic mean) of a and b is 30. The average of a , b , c and d is 40.
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The average (arithmetic mean) of c and d is 50
Step-by-step explanation:
A , b , c and d are different positive numbers
The average (arithmetic mean) of a and b is 30
=> Sum of a and b = 2 * 30
=> a + b = 60
The average of a , b , c and d is 40.
=> Sum of a , b , c & d = 4 * 40
=> a + b + c + d = 160
(a + b + c + d) - (a + b) = 160 - 60
=> c + d = 100
The average (arithmetic mean) of c and d is 100/2 = 50
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