Predict the result
A number divided by three, then increased by seventeen, gives thirty nine. Find the number.

Set up the model
Let n represent the number.
Translate the words before undoing addition and division.

Work the example
Subtract seventeen to get n divided by three equals twenty two.
Multiply by three; the number is sixty six.

Check the result
A lot has twice as many Chevrolets as Dodges and nine more Fords than Dodges, totaling 73 cars.
Take eight seconds to think before the answer appears.
[Eight-second silent pause to work; the answer remains hidden.]
There are sixteen Dodges, thirty two Chevrolets, and twenty five Fords.

Interpret the result
The counts total seventy three and satisfy both the ratio and the nine-car difference.