Question

The weight of a container completely filled with water is 2.25 kg. The container weighs 0.77 kg when it's 0.2 part is filled with water. Find the weight(in kg) of the container when0.4 part of it is filled with water?

Pls help

Answer 1

let the weight of the container be x kg
let the weight of the water when full be y kg

x + y = 2.25 kg
x + .2y = .77
subtract them
.8y = 1.48 kg
y = 1.85 kg
then x+1.85 = 2.25
x = .4 kg

so x + .4y = .4 + .74 kg = 1.14 kg