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About John Zalewski
Expertise
I can help you solve problems involving fractions, decimals, ratios, and algebra. I can teach you how to do math faster, and even in your head. I can teach math definitions, and help you study, if necessary. Please do not ask any graphing, trigonometry, or calculus questions. Try to work through homework questions before asking for assistance.

Experience
I routinely process numbers of all kinds in my head, without need of a calculator.

Education/Credentials
I was an A math student while in high school.

You are here: Experts > Science > Math for Kids > Basic Math > writing equations

Topic: Basic Math

Expert: John Zalewski
Date: 5/7/2008
Subject: writing equations

Question
Ian & Michael together weighed 48 pounds. Ian weighed two pounds more than Michael. How much did Michael weigh?

Answer
Hello, Anthony.

x = Ian

y = Michael

x + y = 48

y + 2 = x

We see that x = y + 2 in the second equation. Now we can substitute y + 2 in for x in the first equation.

y + 2 + y = 48

2y + 2 = 48

2y = 46

y = 23

Therefore, Michael's weight is 23 pounds.

Since Michael weighs two pounds less than Ian, Ian must weigh 25 pounds.

25 + 23 = 48 pounds.

Answer: Michael weighs 23 pounds.

Hope this helps.

Regards,
John

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