exam Maths Puzzle Numerical Ability

Express the compound fraction to lowest terms

28t^3u/3rs^3/7t^4u^4/9s^4

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exam Other Question

A chemist has 300 grams of 20% hydrochloric acid solution. He wishes to drain some off and replace it with an 80% solution so as to obtain a 25% solution. How many grams must be drain and replace it with 80% solution. What is the general form of the equation of a line that is parallel to the x-axis?