( * = multiplication/multiply/times )
Let x - liters of 10% acid solution needed
4-x = liters of 4% acid solution needed
.1x + .04*(4-x)
-------------------- = .07
4
.1x + .04*(4-x) = 4*.07
.1x + .16 - .04x = .28
.06x = .12
x=2
4-x=2
2 liters of 10% acid solution are needed
2 liters of 4% acid solution are needed
If you're still uncertain, we can check our work as so:
.1x + .04*(4-x)
--------------------- = .07
4
.1 * 2 + .04 * (4-2)
------------------------ = .07
4
.2 + .08
------------ = .07
4
.28 = .07 * 4
.28 = .28
Hope I helped.
Answer:
obviously the answer is 72
Answer:
(13/15 - 7/10)
take lcm
<u>13*2 - 7*3</u> = 5/30*100= 50/3%
30
Step-by-step explanation:
Answer:
im thinking n is 6.5 not sure wait not 6.5 its 3.5
I believe the answer is range
