Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
It says that the GCF = 10 and LCM = 180.
Now, GCF = 10 = 5 x 2
and LCM = 180 = 5 x 2 x 3 x 3 x 2
Now we have to find two numbers which do not have anything common besides factors of 5 and 2 (because GCF = 10).
So we are left with 3, 3 and 2.
We have to split this into such a combination that they do not have anything in common. Thus we split it, 3 x 3 and 2.
Hence, the numbers are: 5x2x2 = 20
and 5x2x3x3 = 90
Therefore, xy = 1800
Hence, the answer is C.
P.S. High school math books will never be out of fashion....
Rule: To find the product of any two number, xy = GCF x LCM..... keep this rule in mind! :)