14. the average of 8 no's is 20. The average of first two no's is 15.5 and that of next three no's is 64/3.If the 6th no be less than the seventh and eight no. By 4 and 7 respectively, then find eight no.
Answers
Answered by
2
Answer:
25
Step-by-step explanation:
Avg of 8 nos = 20
Sum of 8 nos = 20*8 = 160
Avg of first two nos = 15.5
Sum of first two nos = 15.5*2 = 31
Avg of next three nos = 64/3
Sum of next three nos = 64/3*3 = 64
Sum of last three nos = 160 - 31 - 64 =65
sixth no = x
seventh no = x+4
eighth no = x+7
therefore,
x+x+4+x+7 = 65
3x = 54
x = 54/3 = 18
eighth no = 18+7 = 25
Similar questions