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/sci/ - Science & Math

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2644376 No.2644376 [Reply] [Original]

This math problem is kicking my ass:
The coolant in a car radiator is a mixture of antifreeze and water. The recommended mixture for your car is 50% antifreeze. If you have a mixture of 7 liters of coolant that is 40% antifreeze, how much antifreeze should you add to bring the mixture up to the recommended level?

>> No.2644389

Too easy.
Please, try this on your own. If you really, REALLY need help, consult your teacher.

>> No.2644386

wtfits?

>> No.2644399

42

>> No.2644405

I honestly don't mind help threads, but...some things are just below even /sci/; and frankly, not doing this yourself is demeaning.

>> No.2644411

1,4 liters of antifreeze?

>> No.2644414
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2644414

>>2644376
>fails at basic algebra

Are you 12? Or just fucking retarded?

>> No.2644418

I don't understand. I hope we're getting trolled, otherwise what is going on with the world?

>> No.2644426

>>2644411
i'm 24 and check that full 44411

>> No.2644442
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2644442

>>2644426
>24
>can't do basic algebra

>> No.2644453

40% of the 7 liters is antifreeze so its 2,8 liters which means that there is (7 - 2.8 = Y)liters of water, so (Y =4.2) liters. You want a 50% mix so just add antifreeze until both quantities are the same ( 2,8 + X = 4,2) -> (4,2 - 2,8 = X) X = 1,4 liters, and this is the amount of antifreeze you should add.

>> No.2644455

>>2644442
at least i tried.

>> No.2644465

>>2644414
anyway i think idiocracy is a great film.

>> No.2644472

>>2644465
Idiocracy is a fucking stupid film that perpetuates the delusion of dysgenics, making people think it exists outside a select few isolated incidences.

>> No.2644474

>>2644376
This is middle school shit

7*.4 + x*1 = .5(x+7)

solve for x (which is in liters)

>> No.2646769

har har

>> No.2646856

>>2644453
lol

What you want is 50% of 7L, which is 3.5 L.
Right now you have 40% of 7L, which is 2.8L.

3.5 - 2.8 = 0.7L So add 0.7L of Antifreeze.

QED, bitches.

>> No.2646902
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2646902

>>2644376
http://www.khanacademy.org/video/introduction-to-ratios--new-hd-version?playlist=Algebra

>> No.2647096

0.4L antifreeze

>> No.2647106

>>2644414
Now, I think that's unfair. I was in algebra when I was only twelve.
And to answer your question, OP is just an idiot.