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The total rainfall for two days was 11.9 inches. The first day's total was 5.4 inches less than the second day's. How much rain fell on each day?

 Aug 29, 2014

Best Answer 

 #22
avatar+11912 
+13

I think DragonSlayer was too tired to use any more brains!when im tired even i act like that becoz it feel that my mind is just about to turn off!like it hapened with me last night when Alan posted an answer explaining me and i couldnt understand what was going on so i just looged out and now in the morning i have come and ive understood that question very well!

 

btw thank Melody and Aziz even i was stuck in the answer which CPhill had posted but now all is clear!Thanks!

 

 Aug 30, 2014
 #1
avatar+129841 
+10

Let x be the rain that fell the second day...then  the first day's rain was x - 5.4

So we have

(x - 5.4) + x = 11.9

 

You should be able to take it from here !!!

 

  

 Aug 29, 2014
 #2
avatar+8262 
0

Is the answer 6.5?

 Aug 29, 2014
 #3
avatar+8262 
0

CPhill, I would rather have the answer to the math problem than the riddles.

 Aug 30, 2014
 #4
avatar+4473 
+5

DS, going on from what Chris posted, all you have to do is combine like terms and solve for x:

 

x - 5.4 + x = 11.9

2x - 5.4 = 11.9

2x = 17.3

x = 8.65...

 

1st day, x - 5.4 --> 8.65 - 5.4 = 3.25 inches.

2nd day, x --> 8.65 inches.

 Aug 30, 2014
 #5
avatar+8262 
0

Thank you thank you! So thankful!

 Aug 30, 2014
 #6
avatar+4473 
0

How did you get 6.5 anyway?

 Aug 30, 2014
 #7
avatar+8262 
0

$$11.9-5.4$$

.
 Aug 30, 2014
 #8
avatar+4473 
+5

Oh, I see.

 Aug 30, 2014
 #9
avatar+8262 
0

At least you helped me, btw!

 Aug 30, 2014
 #10
avatar+4473 
+5

I don't mean to sound harsh, but Chris did post an equation and you should have tried solving that first...

 Aug 30, 2014
 #11
avatar+8262 
0

I did, but it was hard. And confusing.

 Aug 30, 2014
 #12
avatar+118659 
+8

In dragons defence I don't think he has learned any algebra yet.

(I might be wrong)

 Aug 30, 2014
 #13
avatar+4473 
+5

Which part was confusing? The parentheses?

 Aug 30, 2014
 #14
avatar+8262 
+3

I know some algebra. The x part. And the parenthesis 

 Aug 30, 2014
 #15
avatar+8262 
0

Btw, I am drawing Master Chief from Halo.

 Aug 30, 2014
 #16
avatar+4473 
+5

Ah, so creating variables...

 

Imagine this question in a different way. The first day's total was the same as the second day's.

Then, since both days have the same totals, we can just assign a variable, x, for the total number of inches of rain.

So, x + x = 11.9 

 

However, in this question, we have the first day's total as 5.4 inches less than the second day's total.

In this case, x = second day's total, so the first day's total is 5.4 - second day's total or 5.4 - x.

 

Now, instead of just x + x, we have (5.4 - x) + x...

 

 

That's cool, I have heard of Master Chief before!

 Aug 30, 2014
 #17
avatar+118659 
+5

 

rain on second day  + (rain on first day) = 11.9 inches

BUT rain on fist day was just 5.4inches less then on the second day so

rain on second day  + (rain on second day - 5.4inches) = 11.9 inches

Just to make it easier to write down Chris called the rain on second day x

so

x+(x-5.3)=11.9 inches

do you understand this so far Dragon?

 Aug 30, 2014
 #18
avatar+8262 
0

Thanks. I am going to bed bye!

 Aug 30, 2014
 #19
avatar+118659 
+5

Come on Dragon, at least spend a little time thinking about what i just wrote.  

Sorry Aziz I didn't realize that you had just posted something very similar. lol 

I gues Dragon felt a little overwelmed.

 Aug 30, 2014
 #20
avatar+4473 
+5

It's alright.  Yes, I hope he remembers to look over this tomorrow. 

 Aug 30, 2014
 #21
avatar+118659 
+5

Yes we can only hope :)

 Aug 30, 2014
 #22
avatar+11912 
+13
Best Answer

I think DragonSlayer was too tired to use any more brains!when im tired even i act like that becoz it feel that my mind is just about to turn off!like it hapened with me last night when Alan posted an answer explaining me and i couldnt understand what was going on so i just looged out and now in the morning i have come and ive understood that question very well!

 

btw thank Melody and Aziz even i was stuck in the answer which CPhill had posted but now all is clear!Thanks!

 

rosala Aug 30, 2014
 #23
avatar+129841 
+10

DS......Here's a "non-standard" way of solving a problem like this in which we're told that two quantities equal something, and that one of the quantites is larger than the other by some amount.

Take the sum of the quantites and divide it by 2. So, we would have (11.9)/(2) = 5.95

Now take the difference of the quantities - in this case, 5.4, and divide it by 2, as well. So, (5.4 )/(2) = 2.7

Now, add 2.7 to 5.95 = 8.65

And subtract 2.7 from 5.95 = 3.25

And there are your answers......!!!!

Why does this work???....I could tell you, but then I'd have to terminate your existence........

 

 Aug 30, 2014
 #24
avatar+118659 
+5

Thanks Rosala.  

 Aug 30, 2014
 #25
avatar+8262 
+3

Thank you all.

 Aug 30, 2014
 #26
avatar
0

Can someone please explain why you add 11.9 and 5.4? 

 Oct 26, 2016
 #27
avatar
0

Also why do you divide 17.3 by 2??? Plz answer 

 Oct 26, 2016

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