exam Maths Puzzle Numerical Ability

for what value of m will the graphs of 3x+my=6 and 2x-8y=4 have infinite solutions?

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exam Other Question

in selecting a piece of angle iron for a certain applicatioin, you know that you must have no more cross-sectional area than 60 squared cm , else the angle iron will weigh too much Problem: Joe has a collection of nickels and dimes that is worth $5.65. If the number of dimes were doubled and the number of nickels were increased by 8, the value of the coins would be $10.45. How many dimes does he have?