Answer:
Step-by-step explanation:
26% is (26-20)/(50-20) = 6/30 = 1/5 of the way between 20% and 50%. That means 1/5 of the solution is 50% acid.
50% acid: 1/5 · 100 mL = 20 mL
20% acid: 100 mL -20 mL = 80 mL
Delbert must mix 80 mL of 20% acid and 20 mL of 50% acid.
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Maybe you'd like to see an equation. Let x represent the amount of 50% acid required. Then 100-x is the amount of 20% acid needed. The amount of acid in the mix is ...
0.50(x) +0.20(100 -x) = 0.26(100)
(0.50 -0.20)x = (0.26 -0.20)100 . . . . subtract 0.20(100)
x = (0.26 -0.20)/(0.50 -0.20)×100 = 20
This last expression should look a lot like the one we started with in this answer. It shows you how you can almost write down the answer to mixture problems without a lot of work.
Step by step explanation:
<em>The ratio we have is 2:5. 2 is the value for eggs, while 5 is potatoes. We used 6 eggs. Start by dividing 6 by 2, as that's our ratio half. </em>
<em />
<em>6 / 2 = 3.</em>
<em>We can check that by doing 2 x 3 = 6. </em>
<em />
<em>Since it took 3 times the usual ratio, we have to multiply the other side of the equation too. </em>
<em />
<em>5 x 3 = 15</em>
<em />
Answer:
<u>15 potatoes</u>
Answer:
5
Step-by-step explanation:
25x+5=130 ( corresponding angles are congruent )
25x=125
x=5
Answer:
486 mm²
Step-by-step explanation:
Formula: 6a²
a² = 9²
= 81
6(81) = 6 × 81
486
Answer:
48 inches
or
0.8 minutes
Step-by-step explanation:
To find the unit rate of inches per hour, divide 144 by 3.
144÷3=48
You don't need to round because there are no decimals.
To find the time to braid 1 inch, first multiply 3 by 60 (because there are 60 minutes in 1 hour).
3×60=180
Then divide 144 by 180.
144÷180= 0.8
You don't need to round because there are no thousandths.