Question
Three boxes, A, B and C, contained 213 beads. Jenson added some beads into Box A and the number of beads in Box A tripled. He took out half of the number of beads from Box B and removed 33 beads from Box C. As a result, the ratio of the number of beads in Box A, Box B and Box C became 12 : 3 : 5. What was the ratio of the number of beads in Box C to the total number of beads in Box A and Box B at first? Give the answer in its lowest term.
4 m

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Three boxes, A, B and C, contained 213 beads. Jenson added some beads into Box A and the number of beads in Box A tripled. He took out half of the number of beads from Box B and removed 33 beads from Box C. As a result, the ratio of the number of beads in Box A, Box B and Box C became 12 : 3 : 5. What was the ratio of the number of beads in Box C to the total number of beads in Box A and Box B at first? Give the answer in its lowest term.