Sachin answered 14 out of 20 questions correctly on his biology exam. What is his grade as a percentage?

To find Sachin's grade as a percentage, you need to calculate the ratio of the number of questions he answered correctly to the total number of questions, and then convert that ratio into a percentage.

First, you take the number of correct answers, which is 14, and divide it by the total number of questions, which is 20:

[

\text{Fraction of correct answers} = \frac{14}{20}

]

Next, you simplify this fraction. Both the numerator and the denominator can be divided by 2:

[

\frac{14 \div 2}{20 \div 2} = \frac{7}{10}

]

Now that we have the fraction ( \frac{7}{10} ), you can convert it to a percentage by multiplying by 100:

[

\text{Percentage} = \frac{7}{10} \times 100 = 70%

]

Therefore, Sachin's grade as a percentage is 70%. This is why the correct answer aligns with that calculation and is thus confirmed as accurate.