Using proportions, it is found that there are 170 phones in all at the apartment complex.
What is a proportion?
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
The ratio of landline phones to cell phones at an apartment complex is 2 to 3, hence 2/5 of all phones at the complex are landline phones.
There are 68 landline phones in the complex, hence:
2/5n = 68.
n = (68 x 5)/2
n = 170.
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