Question

The cost of 3 bananas at the market is $1. What is the cost of each banana, represented in decimal expansion?

Answer 1

Answer:

Each banana costs $0.33.

Step-by-step explanation:

This can be solved as a rule of three problem.

Rule of three problem:

In a rule of three problem, the first step is identifying the measures and how they are related, if their relationship is direct of inverse.

When the relationship between the measures is direct, as the value of one measure increases, the value of the other measure is going to increase too. In this case, the rule of three is a cross multiplication.

When the relationship between the measures is inverse, as the value of one measure increases, the value of the other measure will decrease. In this case, the rule of three is a line multiplication.

In this problem, the measures are:

- The number of bananas bought

- The total cost

As the number of bananas bought increases, the total cost will increase too, which means that our rule of three is direct.

3 banatas costs $1. We want to know how much costs each banana, so:

3 bananas - $1

1 banana - $x

3x = 1

$x = \frac{1}{3}$

x = 0.33

Each banana costs $0.33.