Question

4/9 kilogram of baking soda costs $2. How much does 1 kilogram of baking soda cost?

please drop an explanation, and equation thanks!

Answer 1

Ok so we want to cross multiply.
To do this you know 4/9=2$ so now you want to know 1=x$
When you do this you get $5

Answer 2

1 kg of baking soda costs $4.50.

Explanation:

Write and solve an equation of ratios, as follows:

4/9 kg $2

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

1 kg x

Multiplying both numerators by 9, we get:

4 kg $18

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

1 kg x

Cross-multiplying, we get 4x kg = $18-kg. Solving for x, we get:

$18-kg

x = -------------- = $4.50

4kg

1 kg of baking soda costs $4.50.