Mr. Williams can grade 50 essays in 7 hours. His assistant, Mr. Wilfred, can do the same job in 14 hours. His other assistant, M
s. Stealth, can grade 25 essays in 6 hours. How long will it take them to grade 200 essays if all three work together?
1 answer:
Answer:
13.44 or 13 11/25 hours
Step-by-step explanation:
First use this format: number of essays/hours
- they are asking if all three work together, how many hours would it take, so this means addition:
50/7 + 50/14 + 25/6 = 200/x
Second, solve:
- least common multiple: 42
300/42 + 150/42 + 175/6 = 200/x
625/42 = 200/x
- cross-multiply
625x = 8,400
x = 336/25 = 13 11/25 = 13.44 (any one of these answers would work)
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D
Step-by-step explanation:
you subtract 15 and 11 = 4 then subtract 9-1 is 8 and then you find the common denominator
Answer:
18
Step-by-step explanation:
Clare has 8 fewer book than mai. If mai has 26 books, how many books does clare have? list all equations that work
(4x-6)/3=8
4x-6=24
4x=30
x=7.5 or x=30/4
12. V is not needed, and just substitute the letters with the numbers the correspond to.