The average height of x number of girl and 15 boys is 123cm.if the average height of boys is 125cm. find the number of girls
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According to ratio , there are 20 boys and 25 girls in the class.
Average height =
sum of height of all students÷ total no. of students
So, 142 = sum of height of all students ÷ 45
Hence, sum of height of all students= 142×45
And,
140= sum of height of all girls ÷ 25
Hence, sum of height of all girls=140× 25
And,
Average height of boys = sum of height of all boys ÷ 20
Hence, sum of height of all boys= avg height of boys × 20
Now,
Sum of height of all students = sum of height of boys + sum of height of girls
142× 45=( 140×25) + (avg height of boys ×20)
Solving the equation , you will get
Avg height of boys = 144.5 cm
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