Answer:
420 + 69 = 489
Step-by-step explanation:
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Switch sides
4/5 (x+3)=y+6
Multiply both sides by 5
5*4/5 (x+3) = 5y+5*6
Simplify
4(x+3) = 57+30
Divide both sides by 4
4(x+3)/4 = 5y/4+ 30/4
Simplify
x+3 = 5y+30/4
Subtract 3 from both sides
x+3 - 3 = 5y+30/4 - 3
Simplify
x=5y+30/4 - 3
Julia has ran more than Carly by 1/4 because 7/8>5/8 and 7/8-5/8=2/8 and that simplified is 1/4 of a mile.