Moore's family compared mobile phone plans to get the best deal. At T-Mobile, the family plan costs $50 per month for the first two lines and $16 for each additional line. At M-Mobile, the family plan costs $45 for the first two lines and $14 for each additional line. Moore's family needs to purchase 5 cell phone lines. How much cheaper is the M-Mobile than T-Mobile? Let's think first. Chain of thought:
The three additional lines at T - Mobile cost $16 x 3 = $48. The total cost of the family plan at T - Mobile is $50 + $48 = $98. The three additional lines at M - Mobile cost $14 x 3 = $42. The total cost of the family plan at M - Mobile is$45 + $ 42 = $87. Therefore, M - Mobile is $98 - 87 = $11 cheaper than T - Mobile.
Therefore, the answer is 11.