exam Maths Puzzle Numerical Ability

how many liters of a 30% solution must be added to 25 liters of 15% solution to make a solution that is 25% salt?

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the school cafeteria surveyed the student body and discovered that 13/15 of the students listed pizza as their favorite lunch. There was a total of 78 students that liked pizza best. how many students were in the student body? To Whomever can assist, Thank you...

A retailer has some video games that cost her $25 dollars each. She wants to sell them at a profit of 80% of the cost. What price should she charge for the games?