John is 5 years older than Mary. In 10 years, twice John's age decreased by Mary's age is 35, and John's age will be
twice Mary's current age. Find their ages now
If xis Mary's age now and y is John's age now, which system of equations could not be used to solve the problem?
y = x+5 and y + 10 = 2x
y=x+5 and 2 (y + 10) - (x + 10) = 35
y = x + 5 and 2 (y + 10) = x
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