The average of 7 number is 40 the average of first three number is 28 find the average of last four number
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x÷7=40
x=40*7=280
sum of all the 7 no.s is 280
y÷3=28
y=28*3=84
sum of first 3 no.s is 84
(280-84)÷4=196÷4=49
the average of last 4 no.s is 49
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7×40 280
40+28
68
- 40=28
50-1=49
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