Make the fractions into improper fractions
4 5/7= 33/7 - Multiply the denominator with the whole number. 4*7=28, add 28 with the numerator. 28+5=33 .
6 3/7=45/7 - Multiply the denominator with the whole number. 6*7=42 , add 42 with the numerator. 42+3=45
33/7*45/7
Multiply the numerators together. Multiply the denominators together.
33*45=1485 ( numerators) , 7*7=49 ( denominators)
=1485/49 or in mixed number: 30 15/49
Answer: 1485/49 , 30 15/49
 
        
                    
             
        
        
        
Step-by-step explanation:
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A. population in 1975 ........................
        
                    
             
        
        
        
Answer
Find out the conversion factor for seconds to minutes and convert  135 seconds to minutes.
To prove
1 minute = 60 second
 for seconds to minutes.

Therefore the conversion factor for seconds to minutes be 

Now convert  135 seconds to minutes. 

= 2.25 minutes 
Hence proved