exam Maths Puzzle Numerical Ability

Anna has 6 liters of 60% acid. How much water should she add to make a solution that is 40% acid?

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exam Other Question

10) Two angles are complementary if their sum is 90e. If the measure of the first angle is xe, and the measure of the
second angle is (3x - 2)e, find the measure of each angle. joe is 5 years older than sally.in 15 yrs joe will be 3 times as old as sally is now.how old is sally now?