Answer:
42°
Step-by-step explanation:
Let the number be n. Then 5n + 4 = n. simplifying, 4n = -4, and n = -1
(answer)
Answer:
Step-by-step explanation:
i think its 1
Answer:
Just about 5-6-7. In that range
Step-by-step explanation:
you have to count up all the fully shaded in squares. And then what u have to do is try and put together the half of squares and so on while counting them up. It is an esta=mation question- mostly.
Answer:
28 l of 80%
42 l of 30%
Step-by-step explanation:
Target is 70 l of 50% solution
It will contain 70*0.5= 35 l of alcohol
x l of 80% solution and y l of 30% solution mixed to get the target solution
x+y=70 is the equation for total volume, and
0.8x+0.3y= 35 is the equation for the alcohol content. Solving this:
- y= 70-x
- 0.8x+0.3*(70-x) = 35
- 0.8x+21- 0.3x= 35
- 0.5x= 35-21
- 0.5 x= 14
- x= 14/0.5
- x=28 l of 80% solution
then
- y= 70-x= 70 -28 l= 42 l of 30% solution
