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John is twice as old as Mary. The sum of their ages is 21. How old is Mary? Let J = John's age and M = Mary's age. Select the system equations that represent the problem.
asked
Dec 4, 2020
Mathematics
middle-school
1
answer
2
votes
109k
views
Evaluate C(5,2). 10 20 60
asked
Jan 28, 2020
Mathematics
middle-school
1
answer
0
votes
95.5k
views
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