Maria comprou 21 metros de corda. Depois comprou 33 metros do mesmo tipo de corda, pagando R$ 9,60 a mais do que pagou na primeira compra. Se, nas duas compras, cada metro de corda custou a mesma quantia, quanto Maria pagou na primeira compra? (A) R$ 6,10 (B) R$ 16,80 (C) R$ 19,20 (D) R$ 26,40 (E) R$ 201,00
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