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16.08.2021 •
Mathematics
Electric saw A cuts planks at a uniform rate of 150 every 30 seconds, and Electric saw B cuts planks at a uniform rate of 130 every 13 second. Of the 2 saws run simultaneously, how many seconds will take for them to produce a total of 225 planks
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Ответ:
Saw A = 150 planks/30 seconds = 5 planks per second
Saw B = 130 planks/ 13 seconds = 10 planks per seconds
5 + 10 = 15 planks per second total
225 planks / 15 planks per second = 15 seconds
15 seconds
Ответ:
12(6^2-6x3)= 216
3^2 = 9
Step-by-step explanation:
216/9 = 24