# Thread: Number Pictures

1. ## Number Pictures

If A is 13, and B is 24, what is C?

2. ## Re: Number Pictures

<span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>C=11</font color=yellow></span hi>

3. ## Re: Number Pictures

I thought this one might have taxed even the great Hans for a little longer! <img src=/S/sigh.gif border=0 alt=sigh width=15 height=15>

4. ## Re: Number Pictures

Can you explain the answer if poss?

5. ## Re: Number Pictures

<span style="background-color: #FFFF00; color: #000000; font-weight: bold"><font color=yellow>Knowing that Rob is a chemistry teacher, you'd think that it has to do with atoms and molecules, but it is a maths puzzle instead.

A = Large + 3 * Small = 13, so 2 * Large + 6 * Small = 26.
B = 2 * Large + 5 * Small = 24.
Subtracting yields Small = 2 and by substituting this, we get Large = 7.
C = Large + 2 * Small = 11 (or: C has one small sphere less than A, so C = A - 2 = 11)</font color=yellow></span hi>

6. ## Re: Number Pictures

And there I was staring at a Periodic Table and scratching my head.

StuartR

7. ## Re: Number Pictures

And I was just staring at the table periodically.

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