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

User Jorge Infante Osorio
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Let L be the number of photos taken by Lisa, R by Robert & C by clair:


L=R

L=3C

R=C+12 Since L=R then 3C = C+12 ==> 3C-C=12==> 2c = 12 & C=6
User ManicBlowfish
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