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if 30 = 18000

1 + 18000/30 =600

:: 70 = 600 x 70

= 42,000

1 + 18000/30 =600

:: 70 = 600 x 70

= 42,000

Jun 20, 2011 | Office Equipment & Supplies

divide your btu rating by 12000. (1 ton = 12000 btu)

For example - a 24,000 BTU Air Conditioner is a 2 ton unit. 24000 divided by 12000 = 2

A 18000 btu air condtioner is a 1 1/2 ton unit 18000 divided by 12000 = 1 1/2

you can find out your btu rating by looking on the tag on your unit.

For example - a 24,000 BTU Air Conditioner is a 2 ton unit. 24000 divided by 12000 = 2

A 18000 btu air condtioner is a 1 1/2 ton unit 18000 divided by 12000 = 1 1/2

you can find out your btu rating by looking on the tag on your unit.

Jun 07, 2011 | Heating & Cooling

check the amperage of the compressor if it is high better to replace.

Nov 30, 2010 | Ruud UBHC Air Conditioner

I will try to solve it systematically so it will be easier to understand. Note: The solution involves solving a quadratic equation.

Let amount of hours estimated be x:

Expected rate: $18000/(x hours)

Time spent extra: 6 hours.

Totals hours spent: (x + 6) hours

New rate: $18000/(x+6 hours)

Now:

18000/(x+6) x

The new rate is less than old rate by $100, therefore we can make the above inequality equality by adding $100 to the new rate.

18000/(x+6) + 100 = 18000/x

Solve by cross multiplaction:

(18000 + 100(x+6) * x = 18000 * (x+6)

18000x + 100x(x+6) = 18000x + 108000

Simplify:

100x(x+6) = 108000 (cancel 18000x on both sides)

x(x+6) = 1080 (divide by 100)

x^2 + 6x - 1080 = 0

Solve the above quadratic equation by any method (completing square, factorization or quadratic formula)

x = (-b+-(b^2 - 4ac)^.5)/2a where a = 1; b = 6; c = -1080

x = 30 or -36 (hours cannot be negative so disregard this result)

Therefore x = Estimated time = 30 hours

Check:

18000/30 = $600 per hour x+6 = 36 $18000/36 = $500 or $100 per hour less than estimated

Let amount of hours estimated be x:

Expected rate: $18000/(x hours)

Time spent extra: 6 hours.

Totals hours spent: (x + 6) hours

New rate: $18000/(x+6 hours)

Now:

18000/(x+6) x

The new rate is less than old rate by $100, therefore we can make the above inequality equality by adding $100 to the new rate.

18000/(x+6) + 100 = 18000/x

Solve by cross multiplaction:

(18000 + 100(x+6) * x = 18000 * (x+6)

18000x + 100x(x+6) = 18000x + 108000

Simplify:

100x(x+6) = 108000 (cancel 18000x on both sides)

x(x+6) = 1080 (divide by 100)

x^2 + 6x - 1080 = 0

Solve the above quadratic equation by any method (completing square, factorization or quadratic formula)

x = (-b+-(b^2 - 4ac)^.5)/2a where a = 1; b = 6; c = -1080

x = 30 or -36 (hours cannot be negative so disregard this result)

Therefore x = Estimated time = 30 hours

Check:

18000/30 = $600 per hour x+6 = 36 $18000/36 = $500 or $100 per hour less than estimated

Nov 12, 2010 | Office Equipment & Supplies

don't shout

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