Food Num. of calories per kilogram Num. of grams of protein per kilo
S 2,000 150
T 1,500 90
36. The table above gives the number of calories and grams of protein per kilogram of food S and T. If a total of 7 kilograms of S and T are combined to make a certain food mixture, how many kilograms of food S are in the mixture?
(1) The mixture has a total of 12,000 calories.
(2) The mixture has a total of 810 grams of protein
I REALLY NEED A GOOD EXPLAINATION ON THIS ONE.
the answer should be D.
i. using trail and error, s = 3 and t = 4
= 3x2000+4x1500 = 12,000
i. using the similar approach also s = 3 and t = 4
= 3x150 + 4x 90 = 810
no any other value for s and t satisfy the above constraoints...