Answer:
11
Step-by-step explanation:
1+red/3=4/1 so 1+red=12 so red=11. we should add 11 red counters
Answer:
Add 15 red counters
Step-by-step explanation:
Number of red counter is 1
Number of blue counter is 3
1:3⇒4:1
Now to make ratio reverse you need to add 11 (12-1) more red counters so that ratio becomes
12:3=4:1
hope this helps