# Lydia has 5 dogs. 2 of the dogs eat 2kg (combined) of food per week. 2 other dogs eat 1kg (combined) per week. The fifth dog eats 1kg of food every three weeks. How much food will the dogs have eaten altogether in 9 weeks?

## This whole problem is what I don’t get

Mar 11, 2018

#### Explanation:

Let's start with the first two dogs. They eat $2$ kg of food per week, so for $9$ weeks $= \text{2 kg" xx 9 = "18 kg}$.

The other two dogs eat $1$ kg food per week, so for $9$ weeks $= \text{1 kg" xx 9 = "9 kg}$.

The fifth dog eats $1$ kg every 3 weeks, so after $9$ weeks $= \text{1 kg" + "1 kg" + "1 kg" = "3 kg}$.

So the total food consumed $=$ the sum of all of them.

So the total food consumed $= \text{18 kg" + "9 kg" + "3 kg" = "30 kg}$