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The math

Taken from Rat Rod Addiction on Facebook


A classic algebra and logic puzzle. I've seen these done with all sorts of things.

Here's the algebraic breakdown:
p+p+p=30, 3p=30, p=10
p+t+t=20, Where p=10: 10+2t=20, 2t=10, t=5
t+2s+2s=9 Where t=5: 5+4s=9, 4s=4, s=1

And that's where we hit the logic puzzle part. Why 2s? well, look at the last line of graphics in the middle and compare that to line 3.
There is a double icon. Logically we can assume this means it's double. It requires you to work backwards through the problem.
Note: This is a fair assumption from our uninvolved standpoint.

The last line:
t+s*p = ?
remembering the order of operations gives us: 1*10 and then + 5 which is 15.
15 is the correct answer where our assumption is correct.

without the assumption the equation cannot be simplified, only rewritten as 10*x+5. The single shock absorber being undefined and thus represented by 'x'

Solved Left to right we get 60. But that'd require the equation be written with brackets like so: (t+s)*p

so, those who answer 60, you should look up the order of operations. We used to call it BOMDAS, more recently I've heard/seen PEMDAS.
If you thought it was 16, 17, 25, 70. I can see how you got there, check the operations you used (multiplication/addition) and the logical trap between lines 3 and 4.

if you came up with any other answer: Might be time to get some math tutoring. you might even find it helps you save money.

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