For this case we must know the following conversion of units:
 
 We calculate first the total number of gallons for 7 jeroboams: 

 Then, a 1.5-liter bottle is converted to gallons: 

 Finally, the number of magnums in 7 jeroboams is given by: 

 Rounding to the nearest whole number: 
 Answer:
 Answer:
 there are 14 magnums in 7 jeroboams