Question

There are 3 grams of sodium in 1/2 of a liter of soda. How much sodium is in 2/3 of a liter of soda?

Answer 1

4 grams

Explanation:

Write and solve an equation of ratios:

x 2/3 l

------- = ----------

3 gr 1/2 l l

Cross-multiplying, we get (1/2) x liter = 2 gr-liter.

Dividing both sides by 1/2 liter, we get:

2 gr-liter 2

x = ------------------ = ------------ grams = 4 grams

1/2 liter 1/2

There are 4 grams of sodium in 2/3 of a liter of soda.