Multiple choice What are the next two numbers x,xx,xxx...? XXXX,XXXXX XX,XX XXX,L 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.