Evaluate 20/a - b, if a=30 and b=1.

Correct Answer is : −13-1/3−31

Correct Answer is : −13-1/3−31

Test Index

BECE Mathematics 2013 Paper

Question : 23

Total: 40

Evaluate

\frac{20}{a} - b

a=30

b=1

Solution:

Concept:

Substitute the given values into the algebraic expression and simplify the fraction.

Explanation:

Given:

a = 30

and

b = 1

Substitute these values into

\frac{20}{a} - b

\frac{20}{a} - b = \frac{20}{30} - 1

Write

1

\frac{1}{1}

to make the subtraction easier.

\frac{20}{30} - \frac{1}{1} = \frac{20 - 30}{30}

\frac{20 - 30}{30} = \frac{-10}{30}

Simplify:

\frac{-10}{30} = -\frac{1}{3}

Answer:

-\frac{1}{3}

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