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Question:

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 12 more photos than Claire. How many photos has Claire taken?

A
6

Explaination

Call the number of pictures Claire taken is x. Lisa has taken 3 times as many photos as Claire then Lisa took is 3x. Robert has taken 12 more photos than Claire then it is x+12. Lisa and Robert have taken the same number of photos: 3x = x+12. Solve the equation we have x=6.