Answer:
Step-by-step explanation:
Given: Fraction of 7th graders got A =
Fraction of 7th graders got B =
The fraction of the students got an A or B = Fraction of 7th graders got + Fraction of 7th graders got B
Hence, the required fraction:
What is the answer for X=3-y
1 answer:
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1) Set up proportions for the ratios:
Cross multiply the fractions:
Divide both sides by 2 to get x by itself.
5 to 2 is equal to 10 to 4.
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2) Set up proportions for the ratios:
Cross multiply the fractions:
Divide both sides by 21 to get x by itself:
14 to 21 is equal to 10 to 15.
------------
OPTIONAL:
To make 2) easier to solve, simplify 14 to 21.
Then, continue with the problem as described above:
Cross multiply the fractions:
Divide both sides by 2 to get x by itself.
5 to 2 is equal to 10 to 4.
------------
2) Set up proportions for the ratios:
Cross multiply the fractions:
Divide both sides by 21 to get x by itself:
14 to 21 is equal to 10 to 15.
------------
OPTIONAL:
To make 2) easier to solve, simplify 14 to 21.
Then, continue with the problem as described above: