PLEASE HELP: Iron intake for a female adult is 3 mg more than twice the amount for a newborn. The amount for an adult female is 15 mg. How much should an infant receive?
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If the iron intake for a newborn should be x, and the iron intake of a female adult is 2x+3=15, then you can solve for x.
Important that you read word for word. The problem says a female adult is (=) it never says a newborn is (=) so the newborn gets x
newborn = x
female adults = 2x + 3
The adult female = 15 so 2x + 3 = 15
Then you solve: And x will be the amount the newborn receives.
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I find it helpful to define variables right away. If there is a subject of a sentence, it gets a variable letter. So in your Zebra problem, the Zebra's running speed gets a Z. The Cheetah's sprinting speed gets a C. And so on.
Next I look at the relationships that are described between these variables. So the Cheetah's speed is three times the Zebra's speed minus 61. We have variables now, so this translates into a formula. C=3Z-61.
Now I examine what is given, and substitute into my general formula. If the given is the Cheetah's speed, then I'm solving for Z. And so on.