Two plus ten times eight
(2+10)*8 = 96
With amounts measured in gallons, let
x = amount of 65% antifreeze
y = amount of 90% antifreeze
1 gal of the 65% brand contains 0.65 gal of pure antifreeze; x gal would contain 0.65x gal. Similarly, y gal of the 90% brand contains 0.90y gal of pure antifreeze.
To obtain 120 gal of 80% antifreeze solution (which contains 0.80•120 = 96 gal of pure antifreeze), we must have
x + y = 120 … … … … … [total volume of antifreeze solution]
0.65x + 0.90y = 96 … [total volume of pure antifreeze]
Solve the first equation for y :
y = 120 - x
Substitute this into the second equation and solve for x :
0.65x + 0.90 (120 - x) = 96
0.65x + 108 - 0.90x = 96
0.25x = 12
x = 48
Solve for y :
y = 120 - 48
y = 72
X times 2x=50
2x^2=50
Divide by 2
X^2= 25
X=5
Length is 10 ft
Answer:
4:50 hrs to school activities
Step-by-step explanation:
the entire school day 6:10 hrs (with breaks)
so if we remove the breaks (which are 1:20hrs in total) we'll have 4:50hrs.
the equation would be: (the time the full day is)-(the total of breaks)= the school activity time.
so: 6:10hrs-1:20hrs= 4:50hrs
there's your answer. 4:50 hrs
*just remember i am working in the hrs format meaning 60 mins= 1hrs*
