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kipiarov [429]
2 years ago
13

Of the 40 students in a class , 2/5 are girls. Of the girls , 1/4 wear glasses. How many girls do not wear glasses

Mathematics
1 answer:
Annette [7]2 years ago
7 0

Answer:

12 girls

Step-by-step explanation:

2/5 x 40 = 16

1/4 x 16 = 4

16 - 4 = 12

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I am trying to find the next number in this number sequence and I dont know how! its like this, 2,9,37,149,597,2389, ... whats t
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Jeff has $1.35 in nickles and dimes. He has a total of 15 coins. How many of each coin does he have?
dlinn [17]

For this case we propose a system of equations.

We know that a dime equals 10 cents and a nickel equals 5 cents.

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x: Let the variable that represents the number of dimes

y: Let the variable that represents the number of nickels

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x + y = 15\\0.10x + 0.05y = 1.35

We multiply the first equation by -0.10:

-0.10x-0.10y = -1.5

We have the following equivalent system:

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We add the equations:

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Answer:

12 dimes and 3 nickels

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now renaming this, so that the normal symbols and names are used for this function definition, so that the input variable is called "x" :

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