Proportionality Math Example 3

Follow the full solution, then compare it with the other examples linked below.

Example 3

easy
If 1212 apples cost \3.60,howmuchdo, how much do 20$ apples cost?

Solution

  1. 1
    Unit price: \3.60 \div 12 = \0.300.30 per apple.
  2. 2
    Cost for 2020 apples: 20 \times \0.30 = \6.006.00.

Answer

2020 apples cost \6.00$.
Cost and quantity are directly proportional (constant unit price). Finding the unit rate first and then multiplying is the most transparent method, though a proportion equation gives the same answer.

About Proportionality

A relationship where two quantities maintain a constant ratio: doubling one always doubles the other, giving y=kxy = kx.

Learn more about Proportionality โ†’

More Proportionality Examples

Example 1 easy

A car travels [formula] miles in [formula] hours at constant speed. How far will it travel in [formu

Example 2 medium

The table shows: [formula]; [formula]; [formula]. Determine whether [formula] is proportional to [fo

Example 4 medium

Is the relationship [formula] proportional? Is [formula] proportional? Explain.

โ† All Proportionality Examples Proportionality Concept