Exam 7: Ratio and Proportion

It costs $120 for 10 feet of 4" conduit. What will it cost for 50 feet of 4" conduit?

Solve this proportion. A wire 2,725 feet long and 85 mills in diameter has a resistance of 0.372 ohm. Find to the nearer thousandth the resistance of 3,600 feet of the same wire. $R _ { 1 } = 0$

Solve this proportion.

Simplify the following ratio. $E _ { \text {LINE } }$

A technician was getting paid $12.80 an hour. The boss decided to give him a 5% raise. What was his new hourly wage?

Find the inverse of each ratio. 5:2

Solve this proportion. $\theta = 360 t _ { i } f$

Solve this proportion. $E _ { 1 }$

Find the inverse of each ratio. 7:8

Simplify the following ratio. 12:3

Solve this proportion. Four workers complete a certain electrical job in 120 hours. How long will it take three workers working at the same rate to do the same type of job?

Solve this proportion. Z= where Z= impedance in ohms E= voltage in volts I = current in amperes

Simplify the following ratio. $E _ { C }$

Solve this proportion. A wire 1,325 feet long has a resistance of 0.65 ohm. What is the resistance to the nearer hundredth of one mile of the same wire?

Solve this proportion. A new "dry pump" is capable of delivering 100 gallons of liquid per minute. How long in hours will it take the pump to deliver 6,000 gallons?

If 16.2 gallons of fuel are used to drive 435 miles, how many gallons are needed to drive 1,680 miles? Carry the answer to one decimal place.

A differential gear has 48 teeth and the drive pinion has 14. What is the final drive-gear ratio?

The answer is in this format: 5:9. If it takes one electrician 18 hours to wire a house and a second electrician 45 hours to wire a similar house, what is the ratio of the second electrician's to the first electrician's time?

Find the inverse of each ratio. 5:112

Simplify the following ratio. 25:10