Solve for z
z = \frac{120}{7} = 17\frac{1}{7} \approx 17.142857143
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1200+2400+70z=4800
Multiply 30 and 40 to get 1200. Multiply 20 and 120 to get 2400.
3600+70z=4800
Add 1200 and 2400 to get 3600.
70z=4800-3600
Subtract 3600 from both sides.
70z=1200
Subtract 3600 from 4800 to get 1200.
z=\frac{1200}{70}
Divide both sides by 70.
z=\frac{120}{7}
Reduce the fraction \frac{1200}{70} to lowest terms by extracting and canceling out 10.
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