Question : What is the third proportion of $2 \sqrt{3}$ and $6 \sqrt{5}$?

Question : Which of the following is true?

Question : Two circles of radii 15 and 18 cm touch each other externally. What is the length (in cm) of the direct common tangent to the two circles?

Question : The fourth proportional to 6, 8, and 12 is:

Question : What is the value of $\frac{15 \div 5 \times 3-12 \times 12 \div 6+15 \div 5 \times 6}{18 \div 3 \times 5-12 \div 6 \times 5+18 \div 9 \times 5} ?$