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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The price of an antique doll increased from $600 to $800. What was the percent of increase? Round to the nearest tenth. Arlene and AJ are Chemist. AJ can do an emulsion polymerization experiment in 10 hours. If AJ and Arlene work together they can do the experiment in 6 hours. How long will it takeo Arlene working by herself to do the experiment?