Answer: 3 / 20
Explanation:
It is best to convert to decimals for such questions. It makes it faster.
Nick mowed 3/5 of the lawn yesterday. In decimals this is:
= 3/5
= 0.60
He then mowed another 1/4 this morning which is:
= 1/4
= 0.25
As these decimals must add up to one, subtract the above from 1 to find the proportion left:
= 1 - 0.6 - 0.25
= 0.15
Then convert back to fractions:
= 0.15 = 15/100
Lowest form would be gotten by dividing both the numerator and denominator by 5:
= 3 / 20