book Maths Puzzle Numerical Ability

hi! hope someone can help me with problems...with solutions please. thanks so much!!!

30) There are 300 people in John�s graduating class. 40% of them went to the Senior Prom w

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book Other Question

Please help me solve x+1/3 = 5 - x+2/7. I came up with 5.6, but the book says the answer is 46/5. I have this big huge paper due, but to do it.........I need an equation that is harder than a two step. Can you please just makeone up that would be easy for a 8th grader to solve