What number should replace the question mark?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 599
In each circle the two numbers on the right are built from the two numbers in the top-left and bottom-right quarters: the top-right number is their sum, and the bottom-left number is their product plus the top-right number.
First circle: \(6+5=11\) and \(6\times5+11=41\)
Second circle: \(2+3=5\) and \(2\times3+5=11\)
Third circle: \(8+9=17\) and \(8\times9+17=89\)
Fourth circle: \(23+24=47\) and \(23\times24+47=552+47=599\)