Problema Solution
The average height of the 4 children is 148 cm. if another child joins the 4 children the average height of the children will become 150 cm. what is the height of the fifth child?
Answer provided by our tutors
Let
the height of the first 4 children be a, b, c, and d
x = the height of the fifth child
the average height of the children = sum from the heights of each children / the number of children
(a + b + c + d)/4 = 148 => a + b + c + d = 148*4 = 592
after the fifth child joins the average height is 150 that is
(x + a + b + c + d)/5 = 150
or
x + 592 = 750
x = 158
The fifth child is 158 cm tall.