exam Maths Puzzle Numerical Ability

Travis Hayes needs 10% hydrochloric acid for a chemistry experiment. How much 5% acid should be mixed with 60 mL of 20% acid to get a 10% solution?

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exam Other Question

you are eating dinner at a restaurant. the restaurant offers 6 appetizers, 12 main dishes, 6 side orders and 8 desserts. if you can order one of each of these, how many different dinners can you order? the length and width of a rectangle are in the ratio 3:2. if the length is increased by 20 and the width is decreased by 5, the ratio of the length to the width becomes 2:1. find the length and width of this rectangle.