Mrs. Wadley is tie-dying t-shirts for her AP Stats class. White shirts cost $4 each and black shirts are $5 each. There are 18 s

Question

3 years ago

11

tudents in the class, and she spent $75. How many white shirts did she buy ? how many black shirts?

1 answer:

Mashutka [201] · Answer 1 · 2022-03-06T02:19:01+03:00

Mrs. Wadley bought 15 white shirts and 3 black shirts.

Step-by-step explanation:

Cost of one white shirt = $4

Cost of one black shirt = $5

Students in class = 18

Money spent on shirts = $75

Let,

white shirts = x

black shirts = y

According to given statement;

x+y=18 Eqn 1

4x+5y=75 Eqn 2

Multiplying Eqn 1 by 5;

$5(x+y=18)\\5x+5y=90\ \ \ \ Eqn\ 3$

Subtracting Eqn 2 from Eqn 3;

$(5x+5y)-(4x+5y)=90-75\\5x+5y-4x-5y=15\\x=15$

Putting x=4 in Eqn 1

$15+y=18\\y=18-15\\y=3$

Mrs. Wadley bought 15 white shirts and 3 black shirts.

Keywords: linear equation, subtraction

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