A 5. Why are 1:3 and 2:6 equivalent ratios? You'd add the same number to 1 and 3 to get the ratio of 2:6 You'd divide 1 and 3 by the same number to get the ratio of 2:6. C. You'd multiply 1 and 3 by the same number to get the ratio of 2:6 D. You'd subtract the same number from 1 and 3to get the ratio of 2.6 В.​