out of 4 number average of first 3 number is 15 and average of last 3 is 16 and if last number is 19 . what is tha first number?
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Answer:
20 is the answer of this Question
Answered by
1
Answer:
let 4 numbers be a b c d
(a+b+c)/3=15
(a+b+c)=15*3=45
a+b+c=45 ------ equation (1)
(b+c+d)/3=16
b+c+d = 16*3=48
b+c+d =48
given d=19
b+c+19=48
b+c= 29
substitute b+c=29 in equation (1)
a+b+c=45
a+29=45
a=45-29
a= 16
the first number is 16
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