exam Maths Puzzle Numerical Ability

Sales = $1000
Cost = ?
Markup is 40% of cost. what is the cost?

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exam Other Question

I have a question about how you simplify fractions with variables. Here is a problem with its solution. Why is the answer not simplified into a mixed number?
3 over 10q plus 9 over 10 q equals 6 over 5 q?
Solve

x + y + z = 5

x - 2y + z = 8

3x - y - z = 3