List of Problems by Type

PAYROLL
    Problems about wages, hourly and weekly rates, overtime, deductions and net pay.
TIPS and TAXES
    Tax rates, property values, tip percents.
MARK UP and DISCOUNT PERCENTS
    Employee discounts, wholesale and retail markups, percent correct/wrong, percent increase 
DIRECT and INVERSE RELATIONSHIPS
    Problems about yields and volumns (tons, pounds, gallons, cubic feet, miles), time
    (days, hours), distance (linear feet, miles, etc.), revolutions per minute/hour.
WORK TOGETHER
    Individual and combined rates and efforts.
MIXTURES
    Combinations of coins, tickets, marbles, nuts or other objects in different amounts.
SOLUTIONS (Liquids)
    Mixing solutions of water and other liquids.
CUTTING/DIVIDING PROBLEMS
    Cutting boards and other items into lengths.
RATIOS
    Ratios of boys to girls, of chemicals in mass.
TRAVEL and DISTANCE
    Boats, trains, people, meteors traveling different distances, rates and speeds.
TOTAL GIVEN
    Total weight, cost or angle size is given or understood.
DEALING WITH NUMBERS AND DIGITS
    Sum, quotient, product and difference or two or more numbers, integers or digits.
DEALING WITH PERIMETERS AND ANGLES
    Sum, quotient, products and differences of angles and sides of triangles and rectangles.
AREAS OF TRIANLGES AND RECTANCLES
    Areas, heights, lengths, widths and perimeters of triangles and rectangles.
VOLUMNS
    Volumes of spheres or baloons and cylinders.
AGE PROBLEMS
    Older/younger than then versus older/younger than now.