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Tiffany T.

asked • 11/20/12

i need help with

-7.8=y/2.45-1.2

1 Expert Answer

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Tiffany T.

yes thank you how about doing prportions from decimals

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11/20/12

Robert B.

tutor

I'm sure I can help you.  I'm just not sure exactly what area you need help with.  Could you offer an example problem?  "Doing proportions from decimals" needs some clarification is all.

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11/20/12

Tiffany T.

can you help with story problems I am not good with them at all I got 4 I need help with here is the first one :A cologne can be made by mixing 2 drops of pure essence with 5 drops of distilled water. How much water should be used with 11 drops of pure essence?
drops of wate

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11/20/12

Robert B.

tutor

To keep the same mixture we want the proportion to be the same.

(? DW)/(11 PE) = (5 DW)/(2 PE).  Lets call the unknown x, as is customary.

x / 11 = 5 / 2.

Multiplying both sides by 11 gives

x / 11 * 11 = 5 / 2 * 11 or

x = 55 / 2 = 27.5.

So 27.5 drops of distilled water are required.

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11/20/12

Tiffany T.

A recipe for spaghetti sauce requires four 16-ounce bottles of ketchup to make 2 gallons of sauce. How many bottles of ketchup are needed to make 18 gallons of sauce? (Hint: Read the problem very carefully.)

A recipe for brownies calls for 4 eggs and 11
2

cups of flour. If the recipe makes 15 brownies, how many cups of flour will be needed to make 160 brownies?
cups

The proper dosage of a certain medication for a 36-pound child is shown. At this rate, what would be the dosage for a 54-pound child?
oz

OK that will be it for today I hope my math tutor at Pierce College sugested this site for me so thank you so so much

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11/20/12

Robert B.

tutor

If you would like more help from me, we could set up an online session.  Check out my profile to contact me.  I do lower my rate for online tutoring.  Let me know if I can help.  I'd be happy to assist you, and it'll be much easier than working through the comments. :)

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11/20/12

Robert B.

tutor

I'll set up one more, but you'll have to solve it and the work on the rest.

X bottles / 18 gal = 4 bottles / 2 gal.

If you'd like any more help, please consider hiring me for an online session via Skype and scribblar.com, the online whiteboard application.  It's a much more effective method for receiving tutoring online.  Thanks!

 

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11/20/12

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