Mathematician vs Engineer

5% of 300 = 300% of 5

5% of 300 = 0.05×300 = 15

Nice

My brain said 10% of 300 is 30, half of 30 is 15.

300*(5%)=15

My brain says 300/20 = 15.

I'm a scientist. I don't have issue how mathematician or engineer solve it. But the guy who solve it is a same person right. So he think differently when he realise he is a mathematician at one second and changed when he asked to think like engineer. I'm just curious of neuro lol

You clearly don't know many mathematicians...

why would you use two division symbols