Question

Which of the following is the difference between the squares of 12 and 13?

• A. 20
• B. 15
• C. 25
• D. 30

Answer 1

The correct option is C 25

${12}^2=12\times 12=144$
${13}^2=13\times 13=169$

${13}^2-{12}^2=169-144=25$