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.
Answer:
The answer is 16%
Step-by-step explanation:
use the percent error formula.

in this problem,
e= 75
t=90
substitute and solve.

16%
we are dealing with percents so rounding to nearest whole number will suffice.
hope this helps!
Answer:
2x³ -5(x²-5)
Step-by-step explanation:
2x3 − 5x2 + 25
=2x³ -5x²+25
=2x³ -5(x²-5)
Add 6+7+9, which gives 22.
Divide 44 by 22, which is 2.
Multiply the ratio by 2:
(6 : 7 : 9) * 2 = 12 : 14 : 18
The lengths of the sides are 12cm, 14cm, 18cm.