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Source: — Problem Solving |
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by Night reader » Sat Jan 22, 2011 3:52 pm
GHong14 wrote:Image
F/J=3/2, (F+40)/J=5/3, J-?
3F+120=5J
2F=3J, F=3J/2

9J+240=10J, J=240
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by VivianKerr » Sat Jan 22, 2011 6:45 pm
This is a great question to Backsolve, plugging in each answer choice.

If we assume Alex's fuel oil bill for January was $240, we can set up a proportion with the ratio given.

3/2 = Feb/Jan

3/2 = Feb/240

720 = 2(Feb)

360 = February's fuel oil bill

If it was $40 more, or $400, then the ratio would be 5/3. Let's reduce the final fraction to make sure:

$400/$240 = 200/120 = 100/60 = 50/30 = 5/3.

The correct answer is (A).
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by Night reader » Sat Jan 22, 2011 7:31 pm
VivianKerr wrote:This is a great question to Backsolve, plugging in each answer choice.

If we assume Alex's fuel oil bill for January was $240, we can set up a proportion with the ratio given.

3/2 = Feb/Jan

3/2 = Feb/240

720 = 2(Feb)

360 = February's fuel oil bill

If it was $40 more, or $400, then the ratio would be 5/3. Let's reduce the final fraction to make sure:

$400/$240 = 200/120 = 100/60 = 50/30 = 5/3.

The correct answer is (A).
I would think twice b4 using this method, as it is too time consuming :(
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