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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