Khan academy help please!

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

John bought 2 horses at rs 20000 each

1: 4 if the wew 35 surfboards at the beach how many were short boards?