Question

What is the topmost number of the above number tower?

• A. 6
• B. 8
• C. 7
• D. 9

Answer 1

The correct option is B 8


We can observe that $1+2=3$ and $2+3=5.$

The number on the higher floor of the tower is the sum of the two numbers beneath it on the floor just below it.

$\therefore$ The number on the top floor is $3+5=8.$