Answer:
The speed of car production increase at 250%
Step-by-step explanation:
we know that
20 cars in a day represent the 100%
so
Using proportion
Find out how much percentage represent the production increase
The production increase is 70-20=50 cars per day
![\frac{20}{100\%} =\frac{50}{x}\\\\x=100(50)/20\\\\x=250\%](https://tex.z-dn.net/?f=%5Cfrac%7B20%7D%7B100%5C%25%7D%20%3D%5Cfrac%7B50%7D%7Bx%7D%5C%5C%5C%5Cx%3D100%2850%29%2F20%5C%5C%5C%5Cx%3D250%5C%25)
therefore
The speed of car production increase at 250%
21) 473 1/5
22) 1/3
23) 4 1/4
Answer:
6
Step-by-step explanation:
Answer:
x= 6
Step-by-step explanation:
![\frac{1}{3}x^{2}-5=7\\](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B3%7Dx%5E%7B2%7D-5%3D7%5C%5C)
Add 5 to both sides
![\frac{1}{3}x^{2}-5+5=7+5\\\\\frac{1}{3}x^{2}=12\\](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B3%7Dx%5E%7B2%7D-5%2B5%3D7%2B5%5C%5C%5C%5C%5Cfrac%7B1%7D%7B3%7Dx%5E%7B2%7D%3D12%5C%5C)
Multiply both sides by 3
![3*\frac{1}{3}x^{2}=12*3\\\\x^{2}=36\\](https://tex.z-dn.net/?f=3%2A%5Cfrac%7B1%7D%7B3%7Dx%5E%7B2%7D%3D12%2A3%5C%5C%5C%5Cx%5E%7B2%7D%3D36%5C%5C)
x² = 6*6
Take square root,
√x² =√6*6
x = 6
Answer:
75
Step-by-step explanation:
Make it an equation with X representing the total number of shoes
If 32% of X equals 24 than 0.32X = 24
Dividing both sides by 0.32 gives you X = 75