Question

Mary cuts an apple into $12$ equal pieces and gives $5$ pieces to her best friend. If she eats $4$ pieces, what part of the apple is left?

• A. $0.75$
• B. $0.25$
• C. $0.5$
• D. $0.1$

Answer 1

The correct option is B $0.25$


Mary eats 4 pieces of the apple and gives $5$ pieces to her friend.
Total number of pieces of the apple eaten $=\frac{5}{12}+\frac{4}{12}=\frac{9}{12}$
Remaining pieces $=1-\frac{9}{12}=\frac{12-9}{12}=\frac{3}{12}$
Reducing by the common factor
$=\frac{3÷3}{12÷3}=\frac{1}{4}$
Multiply by $25$ (to make the denominator a denomination of $10$)
$=\frac{1\times 25}{4\times 25}=\frac{25}{100}=0.25$