exam Maths Puzzle Numerical Ability

A chemist has 400 ml of solution that is 21% acid. How many ml of acid are in the solution?

Is the following set of numbers a perfect triple 7,24,25?

Is the rate 1/4 cup of butter/4 eggs equivalent to the rate 3 cups of butter/48 eggs?

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exam Other Question

What three techniques can be used to solve a quadratic equation? Please could you demonstrate all three techniques using the following equation. Thanks!

12x^2 - 10x - 42 = 0 directions: use quadratic equation x=-b+(rad)(b^2-4ac)/2a to find theroots of the equation x^2-3x+2=0.(the plus sign by the b has a line under it). i can have one of four answers. A)2 B)2,1 C)-1,-2 D)1,1 1/2. which one is correct?