Math (Algebra)
posted by Arnau .
The ratio of three positive integers is 2:4:5 and their least common multiple is 300. What is the sum of the smallest and the largest of the three numbers?

Math (Algebra) 
Steve
If the numbers are LCM(2x,4x,5x) = 20x
So, x=15. But 515, so use x=3 and the numbers are
30,60,75
30+75 = 105
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