Multiple choice general knowledge math & puzzles

4 9 20 43 90 ____

  1. 105

  2. 175

  3. 198

  4. 185

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: multiply by 2, add 2, multiply by 2, add 4, multiply by 2, add 8... The multiplier is always 2, but the additive term doubles each time. Starting from 4: 4×2+2=10, 10×2+0=20, 20×2+3=43, 43×2+4=90, so next is 90×2+5=185. Option D is correct.