The number of the board's price of $6.50 will be 12 and the number of the boards for the price of $9.50 will be 8.
<h3>What is an expression?</h3>
Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division
Given that:-
The total cost of 20 boards is $166. one size costs $6.50, and the second size costs $9.50.
Let the number of the boards for the price of $6.50 is x and for $9.50 is y. So the expression will be given as:-
6.50x + 9.5 y = 166
x + y = 20
Put x = 20 - y
6.50( 20 - y) + 9.5y = 166
130 - 6.50y + 9.50y = 166
3y = 166 -30
3y = 36
y = 12
Now the value of x will be:-
x = 20 - y = 20 - 12 = 8
Therefore the number of the board's price of $6.50 will be 12 and the number of the boards for the price of $9.50 will be 8.
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