book Maths Puzzle Numerical Ability

Jenny has 175 coins in a jar. They consist of nickels and dimes only. The total value of the 175 coins is $11.90. How many nickels and dimes are there in Jenny's jar?

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HOW DO YOU MULTIPLY,SUBTRACT, DIVIDE AND ADD REAL NUMBERS TOGETHER? I NEDD PROBLEMS FOR THE FOLLOWING NUMBERS: SUBTRACTING REAL NUMBERS-13, ADDING REAL NUMBERS-19 AND 27,DIVIDING R please help me answer the question: Find the distance between the points (2,5)and (-4,1)