exam Maths Puzzle Numerical Ability

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1)Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar?

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This year, 75% of the graduating class of Harriet Tubman HS had taken at least 8 math courses. Of the remaining class members, 60% had taken 6 or 7 math courses. What percent of the graduating class had taken fewer than 6 math courses? Will someone please help me with this, this is my last problem, I just do not no HOW to come up with the percent of everything. For the first problem 'What % of the monthly budget