exam Maths Puzzle Numerical Ability

At a school play, 750 tickets were sold. Each adult paid $0.75 admission, and each student, $0.50. How many adults attended, if the receipts were $437.50?

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exam Other Question

well this is actually from algebra 2.
3 The characteristic of log 6198 is _______
2
4
3
1

i really really have no idea how to do this problem... please help!
I need a little help with these 2 problems in putting them in rational form.
-3(x + 5)+3=12 and 2/3x + 1/6x=2