IQ Challenge: Can You Solve This in 10 Seconds?

Given:

a + b = 50
a − b = 50

Add the two equations:

(a + b) + (a − b) = 50 + 50
2a = 100
a = 50

Substitute into the first equation:

50 + b = 50
b = 0

So:

a × b = 50 × 0 = 0

Answer: 0