1 year ago

Suppose the average of 15 consectutive numbers is 15. What is the average of the first five numbers of the set?

1 answer:

7 0

15x15= 225

15x + 105= 225

15x= 225-105

15x= 120

X=8

X+ (x+1) + (x+2) + (x+3)…etc all the way up too +(x+14)=225

The first five numbers of the set: 8, 9, 10, 11, 12

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