Multiple choice

What are the next two numbers x,xx,xxx...?

  1. XXXX,XXXXX

  2. XX,XX

  3. XXX,L

  4. XL,L

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

The sequence represents the multiples of ten: X (10), XX (20), and XXX (30). Since Roman numerals do not use four of the same symbol in a row, 40 is written as XL (10 subtracted from 50) and 50 is written as L.