exam Maths Puzzle Numerical Ability

solve and check the equation for x

2/5 = x-2/20
x=-2/20-2/5
x=-0.1-0.4
x=-0.5

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exam Other Question

The first of the three numbers exceeds the third by one-half of the second. The sum of the second and te third numbers is one more than the first. If the second is subtracted from A salesman gets a comission of $2.65 on each item sold. One morning he sold 15 calculators and 19 pocket radios. Find his Commission

Hi i forgot how to solve problems like this can you show steps and answer please