janae201831
12.01.2021 •
Mathematics
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 5 more than 2 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 59?
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Ответ:
Mark = x = 18 marbles
Don = y = 41 marbles
Step-by-step explanation:
Let the number of marbles
Mark has = x
Don has = y
If Don has 5 more than 2 times the number of marbles Mark has
y = 5 + 2x
Total number of marbles is 59
x + y = 59 Equation 1
Hence, we substitute 5 + 2x for y in Equation 1
x + 5 + 2x = 59
Collect like terms
3x = 59 - 5
3x = 54
x = 54/3
x = 18
Solving for y
y = 5 + 2x
y = 5 + 2(18)
y = 5 + 36
y = 41
Hence, the number of marbles each boy has to sell is :
Mark = x = 18 marbles
Don = y = 41 marbles
Ответ:
there are 31 days in August
365 days in a year
31/365 = 0.0849 probability