how much would remain to be planted if John planted 1/4, Mike planted 1/5 and Peter planted 2/8 ?

Question

number system

Answer 1

r = 1 - 1/4 -1/5 - 2/8

 

first off reduce the expression 2/8 = 1/4

 

r = 1 - 1/4 - 1/5 - 1/4

 

Because the denominators are 4 and 5, the lowest common denominator will be 20.

 

r = 1 (20/20) - 1/4 (5/5) - 1/5 (4/4) - 1/4 (5/5)

 

r = 20/20 - 5/20 - 4/20 - 5/20

r = (20 - 5 - 4 - 5)/20

r= 6/20

r= 3/10