Yelena needs to swim a total of 8 miles this
2 answers:
Answer:
Yelena needs to swim 3 more miles
Step-by-step explanation:
You need to solve for the variable "<em>m</em>", which represents the miles. Based on the information, Yelena swam 5 miles and she needs to swim 8. Solve:
To find the value of <em>m</em>, you need to isolate it on one side of the equation. To do this, you need to get the 8 and 5 on the same side of the equal operation. For this, you need to use reverse operations. This undoes the value from one side and does the same on the other, keeping the equation balanced. Since we have a "positive 5", we take the opposite, which would be a "negative 5". So subtract 5 from both sides of the equation:
Simplify. The 5's cancel each other out, leaving 0. 8-5 is 3:
The total miles left that Yelena needs to swim is 3 miles.
:Done
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Answer:
40 students
Step-by-step explanation:
In this problem, one is given the ratio ( 8 : 3 ), since a ratio is another way of writing a fraction one can rewrite it as; (8) represent the number of students who want to learn about magnets, and (3) represents the number of students who want to learn about magic tricks.
In the problem, it is also given that 25 more students wanted to learn about magnets compared to magic tricks. If one uses the parameter (x) to represent the factor by which the fraction is reduced, then one can get the equation;
8x = 3x + 25
Use inverse operations to solve,
8x = 3x + 25
-3x
5x = 25
/5
x = 5
Substitute back in to find out how many students want to learn about magnets,
8x
= 8(5)
= 40