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Lina20 [59]
3 years ago
14

How do I do 21? (Will mark brainlest for explaining)

Mathematics
1 answer:
Maslowich3 years ago
6 0
Let's say the number is x
75%of x is 15
75%x=15
0.75x=15
x=15/0.75
x=20

or you can say 3/4x=15
x=15*4/3
x=20
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Write a proportion to find how many points x a student needs to score on a test worth 50 points to get a test score of 78%.
olganol [36]
The answer is:  "39 points" .
_______________________________________________________
Explanation:
_______________________________________________________
" x/ 50 = 78/100 " ;   in which "x" equals the number of points needed.

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To solve for "x" ; 
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Look at the denominators:  50 * (what value?) = 100.

→ "100 ÷ 50 = 2" .

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So, let us look at the numerators:

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Divide each side of the equation by "2" ; to isolate "x" on one side of the equation ; and to solve for "x" ;
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 →  78 ÷ 2 = 39 ;

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