Thread: Multiple choice

can someone please help me understand this question?

Thank You :-)



A certain preparation consists of liquids x, y, and z in the proportion 5:2:1. How many gallons of the preparation can be made from a stock of materials consisting of 25 gallons of x, 20 gallons of y, and 8 gallons of z?

A. 25
B. 40
C. 80
D. 53
E. 50

Originally Posted by run_run_3

can someone please help me understand this question?

Thank You :-)



A certain preparation consists of liquids x, y, and z in the proportion 5:2:1. How many gallons of the preparation can be made from a stock of materials consisting of 25 gallons of x, 20 gallons of y, and 8 gallons of z?

A. 25
B. 40
C. 80
D. 53
E. 50

multiply the proportion by an appropriate constant. in this case, 5. multiplying through by 5 we have 25:10:5. so we have 25 gallons of x, 10 gallons of y and 5 gallons of z. now add them up