exam Maths Puzzle Numerical Ability

i need help with metric system measurements

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The hypotenuse of right triangle ABC is 4 cm long. What are the lengths of the other two sides? How do you do it step by step? You have two angles 60 and 30 and a 90. Is there an equation to use? A restaurant has some pancake batter that is too thin. It weighs 12 kilograms and contains 85% flour. How many kilograms of flour should be added so that the final mixture is 90% flour?