book Maths Puzzle Numerical Ability

If a/x+1=c/x
what is an expression for x in terms of c and a?

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book Other Question

Write the following expression using positive exponents and simplify when possible.
5x^-1 A and B are 30km apart. If they leave at the same time and travel in the same direction, A overtakes B in 60 hours. If they walk toward each toher, they meet in 5 hours. What ar