Giải giúp mình với mấy bạn nhé <3

hiệu của hai số là 20. Tìm hai số đó biết:

a) Tỉ số của hai số đó là 6:2

b) Số lớn gấp 3 lần số bé

Mình đã giải được câu a, các bạn ai biết chỉ mình các làm chi tiết câu b nhé 

Giúp mình làm câu b nhé :* :*

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