Answer:
30
Step-by-step explanation:
27 diviend by 9 = 3 so 27 +3 = 30.
Answer:
A
Step-by-step explanation:
x1−9x2−3x1−x2
Answer:
48
Step-by-step explanation:
Ratio: Blue:yellow=4:3

4x12=48
So basically, You make a "equation".
You add 4 and 3 which is 7.
So since you know there is 84 total cards. That will equal the "?". So you divide the 84 and 7 since that will show what you will multiply with 4 and 3 to keep the blue and cards equally balanced. So you multiply the 12 and 4. Which is 48.
So there are 48 blue cards. Hope this helped you C: