Question

A sandwich store charges $20 to have 3 turkey subs delivered and $26 to have 4 delivered. Is the relationship between number of turkey subs delivered and the amount charged proportional?

I know the answer is no but I need help with understanding how the answer is no, please explain!​

Answer 1

No. Explanation below

Explanation:

20$ = 3 subs

26$ = 4 subs

-> into ratios

20 : 3

26 : 4

-> into fractions

20/3 = about 6.67

26/4 = 6.5

6.67 ≠ 6.5

The relationship is not proportional.

Another way:

20/3, 26/4

-> cross multiply

80 ≠ 78

The relationship is not proportional.