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Mr. Rifkin had 240 digital and manual cameras. After donating 82 digital cameras and 26 manual cameras, he had 3 times as many digital cameras as manual cameras left. How many digital cameras did he have at first? |
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Answer» Answer: Step-by-step explanation: LET d = digital cameras Let m = manual cameras
d + m = 240 .....( 1)
(d-82) = 3(m-26) d - 82 = 3 m - 78 d - 3 m = 82 - 78 d - 3m = 16 ...(2)
Subtaracting equation 1 from 2 d + m = 240 d - 3m = 16 --------------- -4m = -224 m = -224/-4 m = 56
d + m = 240 d = 240-m d = 240-56 d = 184
He had started with 184 digital cameras and 56 manual cameras.
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