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30.11.2019 •
Mathematics
Question # 4
1) brett is 18 years younger than mark. carl is 10 years younger
than mark. the sum of the ages of brett, mark, and carl is 212
how old are each of the 3 men? explain:
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Ответ:
Brett is 62 years old, Mark is 80 years old and Carl is 70 years old
Step-by-step explanation:
First; we let Brett age to be = x
let Mark age to be = y
let Carl age to be = z
From the question;
since Brett is 18 years younger than Mark, then Brett age is ;
x = y - 18
Also, since Carl is 10 years older younger than Mark, then Carl age is:
z = y-10
Also, from the question says the sum of the ages of Brett, Mark and Carl is 212
This means when you add all their ages together, you will have 212
so; x + y + z = 212
From the equation above, we can substitute x with y-18 and then substitute z with y-10
y-18 + y + y-10 = 212
3y - 28 = 212
add 28 to both-side of the equation
3y - 28 + 28 = 212 + 28
3y = 240
Divide both-side of the equation by 3
3y/3 = 240/3
y = 80
But x = y -18 = 80 -18 = 62
Also; z = y - 10 = 80 -10 = 70
Since x represent Brett age, then Brett's is 62 years old
Also, y represent Mark's age, therefore Mark is 80 years old
Finally z represent Carl's age, therefore Carl is 70 years old.
Ответ:
25
Step-by-step explanation:
5^4 x 5^3/5^5
5^(3+4)/5^5
5^7/5^5
5^(7-5)
5^2
25