Find the least common denominator of
and
2/7x+3 and 7/8x

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Acertain volume of water contains 100000 hydrogen atoms and 50,000 oxygen atoms how many hydrogen atoms are in a volume of water containing 4 million oxygen atoms

Can anyone explain to me how to do this? anything will .