Answer:
45 girls
Step-by-step explanation:
- Remark
- There are only 2 choices for gender. So if the class is 60% girls, the there must be 100 - 60 = 40% for the boys.
- But we are told that the boys are 30 in number.
- Let x = the total number of students.
Solution
- 40/100 * x = 30 Change the % to a decimal
- 0.4 x = 30 Divide both sides by 0.4
- 0.4 x / 0.4 = 30 / 0.4 Do the division
- x = 30/0.4
- x = 75 students in total
Formula
Total of Boys and Girls = Number of boys + number of girls.
Givens
- Total = 75
- Number of boys = 30
Solution II
- 75 = x + 30 Subtract 30 from each side
- 75 - 30 = x +30 - 30
- 45 = x
- There are 45 girls in the class.
Say the number of adult tickets is x. That means the number of student tickets is 71 less, making it x - 71.
We can add the number of student and adult tickets, because we know their sum is 479.
x + x - 71 = 479
Now, we solve for x.
2x - 71 = 479
2x = 550
x = 275
So, there were 275 adult tickets sold.
This is the picture I am not very good at proofs but hopefully someone can solve it.
Answer:
angular speed = 10,266.424 radians per minute
Step-by-step explanation:
Angular speed w= Velocity (v)/ radius(r)
w= 221760/0.6= 369,600/5280 feet per hour= 70 miles per hour
Circumference of the wheel = 2πr
2π(0.6)= 3.77 feet
Converting feet to miles
3.77/5280= 7.3 e-⁴ miles
No of revolutions= 369600/ 3.77= 98,037. 14 revolutions per hour
Converting it to mins= 98,037.14/60= 1634 rev per minute
2π rad= 1 rev
1634*2π= 10,266.424 radians per minute
To find the area, you multiply base times height. To find the height, you use the rule of a 30-60-90 triangle. This means that the height is 14 units. Multiply 14 and 22 to get the area, which is 308 units squared.
