The width of a photograph is 4 centimeters more than three tenths of the length. If the width is 13 cm, find the length.

Question

Math word problem.

Answer 1

Hello, thank you for taking the time to post your question!

On this type of question you want to set up an expression to represent the information given. For this one that means

W = 4 + 3/10L

Then plugging in W = 13 allows us to solve for the value of L algebraically

13 = 4 + 3/10L

9 = 3/10L

L = 90/3 = 30

That means that the length in this scenario is 30 cm

I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)

Answer 2

W = 0.3 L + 4

W = 13

 

substituting

13 = 0.3 L + 4

9 = 0.3 L

30 = L = 30 cm