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Travis has hired Charlie and Dora to cover the roof with shingles. Dora can install 150 shingles in the same time it takes Charlie to

Travis has hired Charlie and Dora to cover the roof with shingles. Dora can install 150 shingles in the same time it takes Charlie to install 130 shingles, which can be shown using the relationship:

, where d and c are the respective rates at which Dora and Charlie can install shingles.

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