Question

The sum of the masses of two heavyweight boxers is 190kg. ⅘ the heavier boxer is 10kg less than the mass of lighter boxer. Find their masses​

Answer 1

Their masses are 100 kg and 90 kg

Explanation:

Equations

We'll solve the problem by setting only one variable. Let's call:

x = weight of the heavier boxer

Since the sum of the masses of both boxers is 190 Kg:

190 - x = mass of the lighter boxer.

It's given that
`(4)/(5)` of the mass of the heavier boxer is 10 kg less than the mass of the other, thus:

`\displaystyle (4)/(5)x=190-x-10`

Operating:

`\displaystyle (4)/(5)x=180-x`

Multiplying by 5:

`\displaystyle 4x=5(180-x)`

`\displaystyle 4x=5*180-5x`

Simplifying:

`\displaystyle 9x=900`

`x=(900)/(9)=100`

The heavier boxer's mass is 100 kg. The lighter boxer has a mass of 190-100 = 90 kg.

Their masses are 100 kg and 90 kg