Mathematics, 25.07.2019 08:50, GhostElite295

Tommy is twice as old as his younger sister. the sum of the siblings' ages is 21. which equation can be used to determine the age of tommy's younger sister? a. x-2=21 b. x+2x=21 c. 2x=21 or d. x/2=21

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Tommy is twice as old as his younger sister. the sum of the siblings' ages is 21. which equation can...