mvasquez3122p4vahv
28.02.2020 •
Mathematics
Six machines at a certain factory operate at the same constant rate. If four of these machines, operating simultaneously, take 27 hours to fill a certain production order, how many fewer hours does it take all six machines, operating simultaneously, to fill the same production order?A: 9B: 12C: 16D: 18E: 24
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Ответ:
A) 9
Step-by-step explanation:
No. of hours required: 4×27 = 108
If 6 machines working:
108÷6 = 18 hours
27 - 18 = 9 hours fewer
Ответ:
16
at 4 years old , brother is half your age , that is 2
hence your brother is 2 years younger than you.
thus at 18 years old your brother is 16 years old.