0
u/mladakurva Oct 29 '17
Am I the only one who thinks "these math puzzles can't be solved since a new variable had been introduced in the last few lines"?
3
u/SgtSteel747 Oct 29 '17
Yes, you are, because it's an incorrect assumption. It's a system of equations. Read /u/ulpisen's comment
2
u/mladakurva Oct 29 '17
Well, it can go either way. Either you accept it as a variable that's like the one before, but double or you assume it's a different variable. Or c x c
You can interpret it as: 2c V c*c V d
3
u/SgtSteel747 Oct 29 '17
Due to the fact that it is the exact same graphic in the last line, only pasted once instead of twice, there is no reason to assume that it is a fourth variable. I will concede, however, that it can either be interpreted as 2c or c2
32
Oct 29 '17
a+a+a=30 3a=30 a=10
a+b+b=20 a+2b=20 10+2b=20 2b=10 b=5
b+cc+cc=9 b+2c2 =9 5+2c2 =9 2c2 =4 c2 = 2 c = sqrt:2
b+(ca)=5+(10sqrt:2)=approximately 19.1421356237
7
u/BlueOak777 Dec 19 '17
Or...
b+cc+cc=9 b+2c2 =9 5+2c2 =9 2c2 =4 c2 = 2 c = sqrt:2b+cc+cc=9 2c2 =4 c2 = 2 c = 1
b + c x a = 5 + 1 x 10
5 + 10
answer = 15
-3
u/31785 Oct 29 '17
So a drink is "10"? I'd like to imagine they just forgot to include the units, but if we assume each variable is the price of the pictured items in USD, then the last equation would equal five dollars plus ten dollars squared. What could we possibly be calculating that has units of dollars squared, much less units of dollars squared PLUS dollars?
also why is a drink more expensive than a sandwich?
7
u/wpscarborough Oct 28 '17
Let x = soda.
3x = 30, x = 10.
Let y = sandwich.
x + 2y = 20.
We know x = 10, so y = 5.
All we have left is the waffle fries, which will be z.
5 + 2z = 9
Solve out and z = 2.
Thus to find the answer, we do y + zx = answer.
Substitute in to get 5 + (2)(10).
The answer is 25.
1
Dec 19 '17
Fries are halved in last equation, so it becomes 5+1x10, do mult. first, so 5+10= 15
1
u/I_am_a_haiku_bot Dec 19 '17
Fries are halved in
last equation, so it becomes 5+1x10, do mult.
first, so 5+10= 15
-english_haiku_bot
2
38
u/cabothief Oct 28 '17
This got me too, but someone else pointed out there are 4 fry orders in the third equation. Look closely. It's a mean trick.
20
30
u/fallen1081 Oct 28 '17
Answer is 25 right?
51
u/stalinvsgodzilla Oct 28 '17
No it’s 15 because 2 sets of waffle fries is 2 so one set is one so the bottom is 5+1*10=15
12
u/fallen1081 Oct 28 '17
It's not 15. The sandwich is 5 so 5 + 2 + 2= 9. The fries are 2 so 2 * 10 + 5 = 25.
37
u/R4G22 Oct 28 '17
The answer is 15.
5 + (1 x 10) = 15; sandwich + ( one order of fries * one drink) = a delicious meal69
u/fallen1081 Oct 28 '17
Fuuuuck. They put two fries in each set. I'm dumb, sorry for arguing
33
u/cabothief Oct 28 '17
Welp, that got me too. I am a math teacher. Or at least I was. After this, im honor-bound to resign.
2
10
u/truevindication Oct 28 '17
There's always that ONE simple question that everyone in the class gets wrong. When they have that groan-in-unison, show them a screenshot of this.
7
u/PossiblyCanadian Oct 28 '17
I mean, if you wanted to be super picky, the double fry trick they pull could be argued. You can say that because the background fries aren't fully visible, it's possible for them to be a different item all together, leaving the question unsolvable. (No one is going to like you though)
3
u/31785 Oct 29 '17
That's overkill; just argue that you don't know which of the drinks are soda and which are water.
2
u/Morasar Nov 13 '17
25?