exam Maths Puzzle Numerical Ability

The attendance at a ball game was 400 people. Student tickets cost $2 and adult tickets cost $3. If $1050 was collected in ticket sales, how many of each type of ticket was sold?

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lines a and b are perpendicular. The slope of line a is given. What is the slope of line b?

3 Celsius temperature readings can be converted to Fahrenheit readings using the formula F-=9/5C + 32. What is the Fahrenheit temperature that corresponds to each of the following Celsius temperatures: -10, 0, 15, 100.