Answer:
first one is 3.75 and the last is 4
Step-by-step explanation:
because you can multiply 0.75 times 5 and you will get 3.75 and estimate to the nearest 4 GOOD LUCK
If we take 210 to be the 100%, what is 70 off of it in percentage then?
There is nothing there!!!!
Let a be the amount needed of 70% pure antifreeze, and let b be the amount needed of 95% pure antifreeze.
0.7a + 0.95b = 180 * 0.9 .........(1)
a + b = 180 .............................(2)
b = 180 - a ..............................(3)
Plugging the expression for b in equation (3) into equation (1), we get:
0.7a + 0.95(180 - a) = 162 ......(4)
Solving equation (4) gives the value a = 36, and plugging this value for a into equation (2) we get b = 144.
Amounts needed are therefore 36 gallons of 70% pure antifreeze and 144 gallons of 95% pure antifreeze.
11 x < - 66
x < - 66 / 11
x < - 6
hope this helps!
