Uisng the ratio concept, the number of charms that should be put into each group would be 12 and 18 respectively
Given the Parameters :
The group with 2 :
[2 ÷ (2+3)] × 30
(2 / 5) × 30
= 12
The group with 3 :
[3 ÷ (2+3)] × 30
(3 / 5) × 30
= 18
Hence, each group will have 12 and 18 charms respectively
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