1. We assume, that the number 40 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 40, so we can write it down as 100%=40.
4. We know, that x% equals 21 of the output value, so we can write it down as x%=21.
5. Now we have two simple equations:
1) 100%=40
2) x%=21
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=40/21
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.
7. Solution for 21 is what percent of 40
100%/x%=40/21
(100/x)*x=(40/21)*x - we multiply both sides of the equation by x
100=1.90476190476*x - we divide both sides of the equation by (1.90476190476) to get x
100/1.90476190476=x
52.5=x
x=52.5
now we have:
21 is 52.5% of 40
You are 42 years old. (21 x 2 = 42)
Your son’s age is 9 years old (42 - 24 = 18, 18 / 2 = 9)
11÷2.21=4.97
Rounded to the nearest tenth is 5.0
He earns $15 per hour
For 6 hours, he would earn 15 x 6
= $90
Or
15/1 = ?/ 6
Cross multiply
There ? = 15 x 6 = $90
Answer:
y = 15 and x = 22
Step-by-step explanation:
700 = 25x + 10y
x = y + 7
700 = 25(y +7) + 10y
700 = 35y + 175
525 = 35y
15 = y
700 = 25x + 150
550 = 25x
22 = x