The answer is y ≥ −2 − x/2 hope this helps :)
The numerator is 83 if the denominator is 100
X= ladies y = number of cats
<span>Each lady has 2 feet and each cat has 4 feet </span>
<span><=> </span>
<span>x + y = 26 (1) => number of characters </span>
<span>2x + 4y = 84 (2) => number of feet </span>
<span><=> operation : (1) * 2 </span>
<span>2x + 2y = 52 (1') </span>
<span>2x + 4y = 88 (2') </span>
<span><=> operation : (2') - (1') </span>
<span>2y = 26 </span>
<span><=> </span>
<span>y = 20 and x = 32- 16 = 16</span>
<span>10 ladies and 16 cats</span>
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
