45% of 40 is 0.45×40=18 girls
if x girls join then 56% of 40+x is 0.56(40+x)=18+x
22.4+0.56x=18+x
put together like terms
4.4=0.44x
<span>x=10 girls joined</span>

8 0

3 years ago

Contains fractions <br> 6v-5/8=7/8

Novay_Z [31]

Answer: v = 2

Step-by-step explanation:

Your equation:

$\frac{6v-5}{8} = \frac{7}{8}$

You can multiply both sides by 8 to eliminate the fraction, which gives you this:

6v - 5 = 7

Then, you can solve for it:

6v = 12

v = 2

4 0

3 years ago

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Từ các loại phân: NPK (16-8-8), super lân (16% P2O5) và KCl (60% K2O). Hãy tính lượng phân thương phẩm của mỗi loại phân trên để

ruslelena [56]

Jdjdjdjeiicidididieieisikskskdkcodod

6 0

3 years ago

Probability question 25 points

34kurt

9514 1404 393

Answer:

0.09

Step-by-step explanation:

The probability of the complement of A is the difference between 1 and P(A):

$P(A^c)=1-P(A)=1-0.91\\\\\boxed{P(A^c)=0.09}$

6 0

3 years ago

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