you can do this in your head. What's 13 x 10? (HINT: anytime you're mulitplying by 10, just move the decimal place over one digit)
Then, you double it! (since 20 is double 10).
13.0 x 10 = 130
130 gets doubled and becomes 260.
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-13/20 x=5 solution
13 x 20 = 260 square feet (13 and 20 must be in feet)
x - 7 = 13 Therefore, x = 13 + 7 x = 20
20 multiplied by 13 is 260.
13 = 1 x 13, 20 = 2 x 2 x 5. There are no common factors so the LCM is the product, ie 260.