Question
In a jar, the ratio of the number of yellow marbles to the number of black marbles was 1 : 4. Each time, 3 yellow and 6 black marbles were taken out of the jar. A while later, only 42 black marbles were left in the jar. What was the total number of marbles in the jar at first?
3 m

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In a jar, the ratio of the number of yellow marbles to the number of black marbles was 1 : 4. Each time, 3 yellow and 6 black marbles were taken out of the jar. A while later, only 42 black marbles were left in the jar. What was the total number of marbles in the jar at first?