Hey there!
To find this, we should figure out what 1/18 can be multiplied by to get 5/6, because when we end up adding them together after multiplying, 5/6x - 5/6x eliminates x.
One thing that would make this easier is to make 1/18 and 5/6 have the same denominator.
6 goes into 18 3 times, so what we could do is multiply both the numerator and denominator of 5/6 by 3.
That gives us 15/18.
Now that we have the denominators the same, we can see that 1/18 goes into 15/18 15 times by comparing the numerators.
This means the first equation should be multiplied by 15.
Hope this helps!
You add extra zeroes until all numbers have the same quantity. in this case, 2.303 has three numbers after the decimal, so the other three number need it too. 2.300, 2.330, and 2.030. now that you have all of them looking the same now, you can tell which is least and work from there: 2.030 is the least, then 2.300, 2.303 then 2.330 is the largest.
On monday William watered: 1/5 of his plants
On tuesday William watered: 1/5 of his plants
1/5+1/5=2/5 He watered 2/5 of his plants.
2/5+x=1
2/5+x=5/5, x=5/5-2/5, x=3/5
William still needs to water 3/5 of his plants.