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

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More Ratios, rates and proportions questions

Two numbers are in the ratio $5 : 6$ and their sum is $33$ . What is the first number in the ratio?
Two numbers are in the ratio $5 : 6$ and their sum is $88$ . What is the second number in the ratio?
Two numbers are in the ratio $4 : 5$ and their sum is $72$ . What is the second number in the ratio?
Two numbers are in the ratio $4 : 5$ and their sum is $81$ . What is the first number in the ratio?
Two numbers are in the ratio $3 : 7$ and their sum is $90$ . What is the second number in the ratio?
A car travels at a constant speed of $60$ miles per hour. How many miles does it travel in $2$ hours?

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