Question 1040196
Let x = number of rice toppings bought
∴   3x= number of hamburgers bought
 
You know that each hamburger cost $25 and that each rice topping was worth $75 dollars more than each hamburger, which means rice toppings cost $100.
 
∴ 3x(25) + x(100) = 1050
 
75x + 100x = 1050
 
175x = 1050
 
∴ x = 6
 
Therefore, David bought 6 rice toppings and 18 hamburgers.
 
To check the answer substitute 6 as x into the equation from earlier
 
3(6)(25) + 6(100) = 1050
 
450 + 600 = 1050
 
1050 = 1050 
 
∴ Answer is correct.