Answer:
8 more red counters
Explanation:
By adding 8 red counters you would get the ratio
9:3, which can then simplify to 3:1
As there are 3 blue counters, and you want 3 times as many red counters as blue counters:
3×3= 9
You want 9 counters. But there is already a red counter so,
9-1= 8
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