Question

9999=4,8888=8,1816=6,1212=0,那麼1919=？

Answer 1

A small correction in your question. It should be 1816 = 3.

Hint : count the number of circles in the number.

= > 9999

The total number of circles in 9999 = 1 + 1 + 1 + 1 = 4.

= > 8888

The total number of circles in 8888 = 2 + 2 + 2 + 2 = 8.

= > 1816

The total number of circles in 1816 = 0 + 2 + 0 + 1 = 3.

= > 1212

The total number of circles in 1212 = 0 + 0 + 0 + 0 = 0

= > 1919

The total number of circles in 1919 = 0 + 1 + 0 + 1 = 2

Therefore, 1919 = 2.

Hope this helps!