To figure this out, you would simply divide 9 by 54 and get 6. (To check that 6*9 is 54) Thus, using 6 to find your missing number. 5*6 is 30. Now you have your answer 5/9=30/54. To check this see if everything multiplies out correctly. 5*6=30 9*6=54. Therefore, your missing number would be 30.
9 hours or less. with a $3 off coupon she could spend up to $54. divide that by $6 per hour and that gives you a possibility of nine hours of boat rental.
