SOLUTION: When Lily was 3 months old, she weighed 10 pounds. She is gaining about 3/4 of a pound each month. How much should she weigh after 18 months?

Question 842163: When Lily was 3 months old, she weighed 10 pounds. She is gaining about 3/4 of a pound each month. How much should she weigh after 18 months?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

When Lily was 3 months old, she weighed 10 pounds. 

She is gaining about 3/4 of a pound each month. 

How much should she weigh after 18 months?

Let x represent the number of months:

 weight = (3/4)(x-3) + 10lb

 weight at 18mo  = (3/4)(18-3) + 10lb = 21.25lb   0r 21 ¹⁄₄ lb 

 

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