Question 137917
Let x=the number
Then (4/5)x=16   divide each side by 4/5
x=16(5/4)=20
(Note: 16/(4/5): multiply numerator and denominator by 5/4.  Since (5/4)/(5/4)=1, we haven't changed anything.  This will get rid of the fraction in the denominator.  So we have: (16(5/4))/((4/5)(5/4))=16(5/4)/1 or 16(5/4))


1/5 of the number is (1/5)20=4
CK 
4/5 of the number + 1/5 of the number = the number 
16+4=20
20=20

Hope this helps---ptaylor