Since 158 minus 113 is 45, Manny only has to read 45 pages. If Manny reads nine pages a day, you have to divide 45 by 9, which leaves you with 5. It will take Manny 5 days to finish the book.
You can solve it like this
2=milk (a); 1=milk (b)
9=tea (a); x= tea (b)
2:9=1:x (then multiply means and the extremes)
(means are 9 and 1; extremes are 2 and x)
9=2x
9/2= x
4.5 or 4 1/2=x
Therefore, using 1 litre of milk, we can have 4 1/2 tea.
First subtract -19 - 1 = -20
Next, + (-24) is the same as just simply subtracting 24
-20 - 24
Subtract that and you get -44
