exam Maths Puzzle Numerical Ability

solve each system grahpically.
x+y=5
x-y=1

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exam Other Question

Given a three-digit number, interchange the unit digit and the hundreds digit. The product of the original number and the new number is 65,125. What is the smaller three-digit fact I need help in figuring out these kind of problem please. can I get a example of how to do this. problem 12/16 times 4/3 divided by 5/6.