fernanda0203
fernanda0203
18-10-2017
Mathematics
contestada
Does anyone know how to do this
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TheRealM3
TheRealM3
18-10-2017
Maria = x
Tom = y
Use substitution
x+y=30
2y=x
2y+y=30
3y=30
y=10
Tom is 10 years old.
x+y=30
x+10=30
x=20
Maria is 20 years old.
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mathisfun14
mathisfun14
18-10-2017
Tom's age: x
Maria is twice as old as Tom sober age is 2x
2x+x=30
3x=30
x=10
Tom is 10 years old and Maria is 20 years old.
Answer Link
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