exam Maths Puzzle Numerical Ability

A vending machine will accept nickels and dimes only. The attendant checks the machine and finds a total of 42 coins whose value is $3.40. How many coins of each type were there?

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exam Other Question
Points R,S and T are collinear, with point S between points R and T. if RT= 30, and ST= 2x+4, what is the possible range of values for x? What is the sum of the prime factors of 1001?