The average of next two numbers is 75. The average of first three numbers is 50. The average of next two numbers 75. The seventh number is 10 more than the sixth number and 10 less than the eighth number. What is the average of the seventh and eighth number ?
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7
Answer:
85
Step-by-step explanation:
Sum of first three numbers = 50
Sum of 4th and 5th number = 150
Sum of 6th and 7th number =150
7th number = x
6th number = x-10
8th number = x+10
2x-10=150
x=80
7th number = 80
8th number = 90
Average = 85
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