[tex]\large\underline{ \mathcal {SOLUTION}}:[/tex]
The 2 first ratios can be a great clue for us to answer the equivalent ratio.
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42 ÷ 6 = 7
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6:7:1 = 42: 7×7 : 1×7
6:7:1 = 42 : 49 : 7
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[tex]\large\underline{ \mathcal {ANSWER}}:[/tex]