exam Maths Puzzle Numerical Ability

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?

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exam Other Question
Tell whether a triangle with the sides of the given lengths is 45°-45° -90°, 30° -60° -90° or neither.

15, 15, 21.2 You have the following data for the Main Street Corporation:

Gross profit margin 35%
Cost of sales $650,000
Inventory turnover 5
Average collection period 50 days