140 members of a football club have blue eyes? 75% of the members of a football club do
not have blue eyes. How many members do not have blue eyes?

420 members don't have blue eyes

Step-by-step explanation:

First, you can find the total amount of players in the football club by setting a ratio --> 140/x = 25/100 (since the members with blue eyes make up 25% of the club). Once you solve for x in the ratio, you will get 560 which is the total amount of members in the club. Since all the other members other than the 140 don't have blue eyes, then you can simply do 560-140 and you will get 420. Hope this helps :)

The cost of 16 pencils and 10 notebooks is $5.84.

Explanation: You can solve this using linear systems:

Let X be the cost per pencil, and let Y be the cost per notebook.

(1) 7x+8y=4.15
(2) 5x+3y=1.77

Choose a variable to eliminate. I’ll eliminate X first as an example. To eliminate a variable, you must have the same coefficient beside the variable for both equations.

Equation 1 now becomes:

(3) 35x+40y=20.75

Equation 2 now becomes:

(4) 35x+21y=12.39

Now that you have 35 as a coefficient for X in both equations, you can subtract the two equations to officially eliminate it!

(3)-(4)

19y=8.36
y=0.44

Now that you have the value of Y, substitute that value into either one of the equations to get X.

Substitute y=0.44 in (1)

7x+8(0.44)=4.15
7x+3.52=4.15
7x=0.63
x=0.09

Therefore, the cost per pencil is $0.09/pencil and the cost per notebook is $0.44/notebook.

Almost done lol...

To find the cost of 16 pencils, multiply 0.09*16. That gives you $1.44, which will be the cost of 16 pencils.
The cost of 10 notebooks is 0.44*10, which gives you $4.40. That’s the cost of 10 notebooks.

To find the total price, add these values together!

1.44+4.40=5.84

Therefore, the cost of 16 pencils and 10 notebooks is $5.84.

Hope that helps シ