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vova2212 [387]
3 years ago
8

Kuri spent a total of $68 on trading cards. His collection contains two types of cards. A pack of trading card A $4 and a pack o

f trading card b cost $7. HOW many packs of each trading card were purchased if the total number of packs is 11?​
Mathematics
2 answers:
masya89 [10]3 years ago
8 0

Answer:

8 of Card B and 3 of card A. Hope this helps

inysia [295]3 years ago
8 0

Answer:

Kuri purchased 3 packs of trading card A, and 8 packs of trading card B.

Step-by-step explanation:

1. First name the variables:

a = number of packs of trading card A

b = number of pack of trading card B

2. As a pack of trading card A costs $4, a pack of trading card b costs $7 and As Kuri spent a total of %68 on trading cards, the first equation is:

4a+7b=68 (Eq.1)

3. As Kuri purchased a total number of 11 packs, the second equation is:

a+b=11 (Eq.2)

4. Solve Eq.2 for a:

a+b=11\\\\a=11-b (Eq.3)

5. Replace Eq.3 in Eq.1 and solve por b:

4(11-b)+7b=68\\\\44-4b+7b=68\\\\-4b+7b=68-44\\\\3b=24\\\\b=\frac{24}{3}\\\\b=8

6. Replace the value of b in Eq.3:

a=11-8\\\\a=3

Therefore Kuri purchased 3 packs of trading card A, and 8 packs of trading card B.

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2 years ago
The table displays the number of students in each grade at Richmond High School who will or will not be attending the amusement
Pani-rosa [81]

Answer:

P( eleventh\: \: |\: \: FT)=  0.2453 \\\\P( eleventh\: \: |\: \: FT)=  24.53\% \\\\

Step-by-step explanation:

We are given a joint probability table.

There are four different graders in a school

1. Grade Ninth

2. Grade Tenth

3. Grade Eleventh

4. Grade Twelfth

Field trip refers to the students who will attending the amusement park field trip.

No field trip refers to the students who will not be attending the amusement park field trip.

We want to find out the probability that the selected student is an eleventh grader given that the student is going on a field trip.

P( eleventh\: \: |\: \: FT)= \frac{P( eleventh\: \: and \: \: FT)}{P(FT)}

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Where P(FT) is the probability of students who will be going to field trip

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