exam Maths Puzzle Numerical Ability

solve the following if a = 7 and b = 3.

3ab + 6 =

12a divided by (2b) =

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exam Other Question

3/4x-1/3x+=5/6x-5 how many milileters of a 20% acis solution must be mixed with 30ml of an 80% acid solution to make a 32% acid solution? i have to show a chart and fill it out