Multiple choice general knowledge math & puzzles

In a triangle ABC, a line is drawn parallel to BC, which cuts AB at D and AC at E. The ratio of AD:AB is equal to 3:5. What is the ratio of DE:BC?

  1. 3:4

  2. 3:5

  3. 4:5

  4. Impossible to Say

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

By Basic Proportionality Theorem (Thales theorem), if DE is parallel to BC, then AD/AB = AE/AC = DE/BC. Given AD:AB = 3:5, therefore DE:BC = 3:5.