book
Maths Puzzle
Numerical Ability
Rian is 4 years older than Christian. Twelve years ago Rian was two times as old as Christian. Find their present ages.
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book Other Question
Ali is 30 years younger than his father.if thier cobnied age is 80 years.how old is each person.
The worksheet says:
Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solution or infinitely many solutions.
The problem:
3x-y=4
2x-3y=-9