Question 104432: The width of hotographis 4 centimeters more that three tenths of the length. If the width is 13 cm, find the length.
Answer by stormy(4)   (Show Source):
You can put this solution on YOUR website! I'm assuming you mean "The width of a photograph is..."
Let W = the width and L = the length, both in centimeters.
The width is: " w = "
Four cm more than: " 4 + "
Three-tenths of the length: " 0.3 * L "
Now simply put it all together:
w = 4 + 0.3 * L
Substitute 13 for the width, and solve for L:
13 = 4 + 0.3 * L
13 - 4 = 0.3 * L
9 = 0.3 * L
9 / 0.3 = L
L = 30 cm
To check the solution, go back to the original problem. Three tenths the length is:
0.3 * 30 = 9
Four centimeters more than this amount is:
9 + 4 = 13 cm
This is the width given in the problem, so our answer is correct.
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