Jobs and earning money — Question 3

If Zing earns $21.75 by running an errand 3 times and walking the dog 3 times, how many more times must he walk the dog to earn $26 for gas?

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Zing’s job possibilities

Job Income / Earnings
Walk a dog $3.75
Run an errand $3.50
Wash a car $7.50
Babysit $5.00