Question

the average height of 5 boys is 160 cm.The heights of 4 boys are 152 cm,156 cm,164 cm and 160 cm.Find the height of the fifth boy.,,,,

Answer 1

Let the height of the fifth boy be 'xcm' ,
Given heights of 4 boys are 152cm,156cm,164cm and 160cm
Average height of 5 boys = 160cm
⇒(152cm+156cm+164cm+160cm+xcm)/5 = 160cm
⇒(632cm+xcm)/5 = 160cm
⇒632cm+xcm = 160cm×5 = 800cm
⇒xcm=800cm-632cm
⇒xcm=168cm .
Therefore,the height of the fifth boy = 168cm. 

Answer 2

Answer:

let the 5 boy height = x

the average height of 5 boys = 160

( 152 + 156 + 164 + 160 + x ) = 160

632 + x = 160

632 – 160 = x

472 = x

height of 5 boy is 472