Answer:
x = amount of pure acid to be added = 6.67ml
Step-by-step explanation:
George wishes to increase the percent of acid in 50ml of a 15% acid solution in water to 25% acid, how much pure acid must you add?
let
x = amount of pure acid to be added
15% of 50 + x = 25% of 50 + x
(0.15 * 50) + x = 0.25(50 + x)
7.5 + x = 12.5 + 0.25x
Collect like terms
x - 0.25x = 12.5 - 7.5
0.75x = 5
x = 5/0.75
x = 6.6666666666666
Approximately,
x = 6.67
x = amount of pure acid to be added = 6.67ml
Step-by-step explanation:
4/5 (b +9)
4/5×b + 4/5×9
4b/5 + 36/5
4b/5 + 72/10
4b/5 + 7.2
Hey there, Lets solve this one by one
Firstly, a<span>dd </span>11<span> to both sides
</span>
<span>
Now, </span><span>Simplify </span><span>5+11</span><span> to </span><span>16
</span>
<span>
Finally, d</span><span>ivide both sides by variable </span><span>y
</span>

<span>
</span>
The answer is going to be around 7 countries
Answer:
4 dimes i think and 5.25 worth of quarters
Step-by-step explanation: