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telo118 [61]
3 years ago
13

A test has 20 questions. How many do you need to answer correctly in order to get 4/5 of them right?

Mathematics
1 answer:
vova2212 [387]3 years ago
8 0
The answer is:  " 16 " .
____________________________
Explanation:
____________________________
Method 1)
____________________________
(4/5) *(20/1) = ?  

The "5" cancels to a "1" ; and the "20" cancels to a "4" ;  
   (since "20÷5=4" ; and "5÷5=1") ;
________________________________
Rewrite as:  (4/1) * (4/1) = 4 * 4 = 16.
_________________________________
Method 2)
_______________________________
4/5 * 20/1  = (4*20)/(5*1) = (80/5) = 16 .
_________________________________
Method 3)
_________________________________
4/5 * 20 = ?  ;

4/5 = 8/10 = 0.8 ;

0.8 * 20 = 16.0 = 16.
_________________________________ 

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linear equation in slope intercept form for this situation. mary is selling popcorn for $5.00 per bucket and hotdogs for $4.75 e
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