Question

Crystal's cafe has regular coffee and decaffeinated coffee. this morning, the cafe served 30 coffees in all, 40% of which were regular. how many regular coffees did the cafe serve?​

Answer 1

`\boxed{\rm{12 \: regular \: coffees}}`

Explanation:

The cafe have two types of coffee: regular and decaffeinated. Total no. of coffees served in the morning = 30 and out of which 40% were regular. Then no. of regular coffees in number are:

`= 40\% \: of \: 30`

`= (40)/(100) * 30`

`= \boxed{12}`

~Total no. of regular coffees served were 12 (ans).

Answer 2

Crystal's Cafe served 12 regular coffees.

Explanation:

Let's denote:

• R as the number of regular coffees served.
• D as the number of decaffeinated coffees served.
• The total number of coffees served = R + D = 30.

Given that 40% of the total coffees were regular,

we can write the equation:

`\sf 40 \% \textsf{ of } 30 = R`

Solving for R:

`\sf R = (40)/(100) \textsf{ of } 30`

`\sf R =0.40 * 30`

`\sf R = 12`

So, Crystal's Cafe served 12 regular coffees.