ADIAZ1815GO ADIAZ1815GO Mathematics Answered PLEASE HELP!! PLEASEE 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