the average of 3 numbers is 20.if 2 of the numbers are 15 and 25 ,what is the third number
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let the 3rd number be 'x'.
given two numbers are 15,25
and average of the three numbers is 20
so,
(15+25-x)/3=20
when we take x to other side of equality,then
15+25+x=20*3
40+x=60
x=60-40
so x=20
hence the third number is "20"
given two numbers are 15,25
and average of the three numbers is 20
so,
(15+25-x)/3=20
when we take x to other side of equality,then
15+25+x=20*3
40+x=60
x=60-40
so x=20
hence the third number is "20"
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