Two numbers are in the ratio $4 : 3$ and their sum is $21$ . What is the second number in the ratio?

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Two numbers are in the ratio $5 : 6$ and their sum is $77$ . What is the first number in the ratio?
Two numbers are in the ratio $3 : 7$ and their sum is $60$ . What is the first number in the ratio?
Two numbers are in the ratio $2 : 7$ and their sum is $36$ . What is the first number in the ratio?
Two numbers are in the ratio $5 : 3$ and their sum is $56$ . What is the first number in the ratio?
Two numbers are in the ratio $5 : 7$ and their sum is $108$ . What is the second number in the ratio?
A car travels at a constant speed of $72$ miles per hour. How many miles does it travel in $2$ hours?

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