100
250+250=n
What is 500?
200
400+400=n
What is 800
300
500+1,000=n
What is 1,500?
400
n+200=600
What is 400?
400
n+500=700
What is 200?
400
1,000+1,000=n
What is 2,000?
500
n+500=1000
What is 500?
500
500-n=234
What is 266?
500
n+170=500
What is 330?
500
750+750=n
What is 1,500