Lisa and Robert have taken the same number of photos on their school trip. Lisa has taken 3 times as many photos as Claire. Robert has taken 12 more photos than Claire. How many photos has Claire taken?
6
8
10
12
Detailed Explanation
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.
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