exam Maths Puzzle Numerical Ability

David has collected $6.50 in nickels and dimes. If he has 75 coins, how many of each kind of coin does he have?

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exam Other Question

Which does not represent a possible intersection of a line and a right cylinder? solve this system of equation by graphing
1. 3x-6y=-9
2x-4y=-6

2. x+y=-6
-x+2y=6