78:18

The ratio 78:18 can be simplified. To do this, you can divide both numbers by their greatest common divisor (GCD).

First, find the GCD of 78 and 18.

• The prime factorization of 78 is: \( 78 = 2 \times 3 \times 13 \)

• The prime factorization of 18 is: \( 18 = 2 \times 3^2 \)

The common factors are \( 2 \) and \( 3 \). Therefore, the GCD is \( 2 \times 3 = 6 \).

Now, divide both numbers by their GCD:

• \( 78 ÷ 6 = 13 \)
• \( 18 ÷ 6 = 3 \)

Thus, the simplified ratio is: 13:3.