Finishing topic: A gives M30 yuan, and the amount of M is twice that of A; ; 2(A-30)=M+30

By analogy, m gives K￥30, and the amount of k is twice that of m; 2(M+30-30)=K+30

K gives A 30 yuan, and the amount is equal; K+30-30=A-30+30=M+30-30, that is, K = A = M.

Replace everyone else with A, and the first equation becomes 2(A-30)=A+30, and A=90 is solved.

So A has 90 yuan, so choose B.

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