adiaz1815 adiaz1815 01-11-2022 Mathematics Answered PLEASE HELP PLEASE!!! PLEASE SHOW WORK Jane is twice as old as Barbara. Michael is 7 years older than Jane. If Mikael is 21, which equation could be used to find Barbara's age (b) A. 2b-7=21 B. 2b+7=21 C. b/2-7=21 D.b/2+7=21