The ratio of boys to pizzas is 3:2
The ratio of pizzas to boys is 2:3
These seem kinda obvious, so I am not sure what more to add. If you have any questions, post a comment and I'll think of something clever.
Ratio Q2: The ratio of pieces of sausage to pieces of pepperoni on these pizzas is 3:1.
For every 1 piece of pepperoni there are 3 pieces of sausage.
Ratio Q3: Classroom #1 has 15 boys to 20 girls, or 15:20. Break this down to its simplest form:
For Classroom #2, we need to solve for girls. So flip the ratio so that girls "?" is on top. In this case, we also flip the 3/4 ratio to 4/3. So: ? is to 12 as 4 is to 3.
Now solve for ?, which is 16 girls in classroom 2.
For boys in classroom 3, describe the ratio with the boys "?" on top, which is now 3/4. So ? is to 12 as 3 is to 4. Solve for the ?, which is 9 boys in classroom 3.
The final matrix is:
One important check to make sure you got the matrix correct: The ratio of Boys on top to Girls on the bottom row is 3:4 (there are more girls than boys). Hence, the top row must always be smaller than the bottom row. If they are not, then you forgot to flip the ratio, or something.
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