the average height of 4 boys is 140 cm. if sum of the heights of 3 of them is 415cm, what is the height of the 4th boy?
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Let the height of boys be a, b, c and d
Average Height = 140
=> (a +b+c+d) /4 = 140
=> a+b+c+d = 560 cm ----------(1)
Sum of Height of first 3 = 415
=> a+b+c = 415 cm -------------(2)
On subtracting equation 2 from 1,we get
d = 145 cm
Height of 4th boy = 145 cm
Average Height = 140
=> (a +b+c+d) /4 = 140
=> a+b+c+d = 560 cm ----------(1)
Sum of Height of first 3 = 415
=> a+b+c = 415 cm -------------(2)
On subtracting equation 2 from 1,we get
d = 145 cm
Height of 4th boy = 145 cm
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