Answer: 4
Step-by-step explanation:
To find how many 3/4 are in 3, you can divide 3 by 3/4.
[divide by 3/4 is same as multiply by 4/3]
4
Now, we know there are 4 3/4's in 3.
We let x = pounds of alloy that is 15% tin
The problem is modeled by the equation:
0.11(30) = 0.15x + 0.09(30-x)
The equation means that the amount of tin does not change. Also, the amount of alloy (total weight - weight of 15% alloy) is (30-x).
Solving for x:
3.3 = 0.15x +2.7 - 0.09x
.06x = 0.6
x = 10 lbs
30-10 = 20 lbs
<span>10 lbs. of the 15% alloy and 20 lbs. of the 9% alloy</span>
Step-by-step explanation:
it's so simple....
Lylas sister is 7 years less than twice lylas age. it means ( 7 - 2x )
The sum of lylas age and her sisters age is 41.
it means x + ( 7 - 2x ) = 41
mark it brainliest if it helps you ❤️
Answer:
13.9
Step-by-step explanation:
To find the mean, add the two numbers and divide by two.
(13.9+13.9)/2=13.9
