Lisa and Robert have taken the same number of photos on their school trip. Lisa has taken 3 times as many photos as Claire and Robert has taken 24 more photos than Claire. How many photos has Claire taken?	Choose one.
A) 6 B) 8 C) 10 D) 12 E) 14

Rationale: l = r l = 3 c r = c + 24 3 c = c + 24 c = 12 the answer is d .
Answer: D