Answer:
20 grams
Step-by-step explanation:
Let g represent the grams of solution that were replaced. Then the amount of alcohol in the mix is ...
16%·(120 -g) +100%·g = 30%·120
19.2 +0.84g = 36.0 . . . . simplify
0.84g = 16.8 . . . . . . . . . .subtract 19.2
g = 20 . . . . . . . . . . . . . . .divide by 0.84
20 grams of solution were taken out and replaced.
Answer:
The answer is
<h2>1520.5 cm²</h2>
Step-by-step explanation:
Surface area of a sphere is given by
S = 4πr²
where r is the radius
From the question r = 11cm
So the surface area of the sphere is
4π(11)²
= 4(121)π
= 484π
= 1520.5308
Which is
1520.5 cm² to the nearest tenth
Hope this helps you
70 times .9 is 63 so 90 minus 63 is27 so it was $27