2022 · Q31
If a = 3b, 4b = 5c, 6c = 7d, then what is (d+a)/(d-a) equal to?
Elementary MathematicsRatio and Proportion
- A27/43
- B43/27
- C-27/43
- D-43/27
Explanation
a = 3b = 15c/4 = 105d/24 = 35d/8. Then (d+a)/(d−a) = (1+35/8)/(1−35/8) = (43/8)/(−27/8) = −43/27. The keyed option is D.