Where $(,)$ is the greater common divisor and $[,]$ the smallest common multiple.
In general how do you solve this kind of problems?
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$xy=(x,y)\cdot[x,y]$ – Rushabh Mehta Apr 14 '19 at 17:41
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Hint $$(x,y)\cdot[x,y]=x\cdot y\implies x\cdot y=68040$$ There is a nice explanation here – Dr. Mathva Apr 14 '19 at 17:42
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Does this work for you: $x=18, y=3780$ ? – lhf Apr 14 '19 at 17:54
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Thanks everybody. I understand it. – Maria Guthier Apr 14 '19 at 17:54