If you let BC years be negative then it could be the difference between -150 and 200 which is 200 - -150 = 350.
However, as there was NO year 0 (as zero did not come to Europe until around the 11th-12th centuries and Dionysius Exiguus ("Little Dennis") created the AD/BC system of dates in 247 Anno Diocletani, calculating Jesus' birth to be 531 years earlier and made it 1 AD, thus making his "current year" 532 AD; and explains why the 21st century AD did not start until 2001).
Thus from 150 BC to 200 AD is one less at 349 years.
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200 years.
160 and 180.Also 200 if it is not strictly between but also includes 150 and 200 in the possible numbers.The lcm of 4 and 10 is 20; so all multiple of 20 are divisible by 4 and 10.The multiples of 20 between 150 and 200 are 160 and 180; and 200 if between 150 and 200 inclusive
150
200 of them.
It is 200