exam Maths Puzzle Numerical Ability

Bottle A contains an 80% acid solution. Bottle B contains a 20% solution of the same acid. How many cc from bottle A should be mixed with solution from bottle B to make 40 cc

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exam Other Question
Determine the maximum and minimum value of the following set of numbers.

3, -36/7, -1, -2/3, 5/4, -5, 26/9 A common mistake when solving equations is the following:
The equation: 2(x- 2) = x+ 3
First step in solving: 2x- 2= x + 3
Write a clear explanation of what error has been made. What could be done to
avoid this error?