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secondary 2 | Maths
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Date Posted: 3 years ago
Views: 209
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(a) correct, 10 hours
(b) 5 machines can print 4800/2 x 5 = 12000 in 2 hours
Remaining number to print = 24000 - 12000
Rate of 2 machines per hour = 4800 / 2 = 2400
Rate of 4 machines per hour = 2400 x 2 = 4800
No. of hours for the 4 remaining machines = 12000 / 4800 = 2.5
Total number of hours = 2 + 2.5 = 4.5
(b) 5 machines can print 4800/2 x 5 = 12000 in 2 hours
Remaining number to print = 24000 - 12000
Rate of 2 machines per hour = 4800 / 2 = 2400
Rate of 4 machines per hour = 2400 x 2 = 4800
No. of hours for the 4 remaining machines = 12000 / 4800 = 2.5
Total number of hours = 2 + 2.5 = 4.5
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