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Maths Puzzle
Numerical Ability
1) list 5 prime numbers.
2) find the prime factors of 624.
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book Other Question
translate to a system of equations and solve.
roberta is 25 years older than her daughter, Cindy. In four years, Roberta will be twice as old as Cindy. how old are they now?
i MADE The mistake when I was solving equations and did this
The equation 2(x-2) = x +3
First step in solving 2x-2=x+3
What error did I make? How could I avoided it? thanks