Answer:
18
Step-by-step explanation:
If item D is equal to 36, then item C will have been equal to 18.
Adding these two sales, we get 54.
The number of items C sold today = 18
"It is a statement which consists of an equal symbol between two mathematical expressions."
For given example,
Suppose we sold 'm' number of item 'C' and 'n' numbers of items D.
We have been given, item C sold half as many times as items D.
[tex]\Rightarrow m=\frac{n}{2}[/tex] ..............(1)
Altogether, we sold 54 of these menu items.
So, we get an equation,
m + n = 54 ..............(2)
Substitute the value of m in equation (2),
⇒ (n/2) + n = 54
⇒ 3n/2 = 54
⇒ 3n = 108
⇒ n = 36
This means, we sold 36 'D' items today.
Substitute above value of n in the equation (1),
⇒ [tex]m=\frac{36}{2}[/tex]
⇒ m = 18
This means, we sold 18 'C' items today.
Therefore, the number of items C sold today = 18
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