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saveliy_v [14]
3 years ago
9

In Mrs. Robinson's class, there are 16 girls and 14 boys. The mean of the girls' heights is 63.7 inches, and the mean of the boy

s' heights is 65.4 inches. What is the mean of the heights of all 30 students? Express your answer as a decimal to the near tenth.
Mathematics
1 answer:
Elodia [21]3 years ago
8 0

Answer: 64.6

Step-by-step explanation:

If you add up 63.7 and 65.4 and then divide by 2 you get 64.6.

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Sam's eggs were ready at 8:00 A.M. If it took Sam 5 minutes to cook the eggs, when did he start cooking the eggs
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Answer:

7:55 AM

Step-by-step explanation:

Eggs ready at 8:00 AM

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franklin sold water bottles in two sizes, large ($2.50 each ) and regular ($1 each). He sold 113 bottles altogether and collecte
Ivahew [28]
Let's make a system of equations.

1 large bottle = l
1 regular bottle = r

l + r = 113
221 = 2.5l + r

Isolate r in the first equation and substitute it into the second equation:

l + r = 113
r = 113 - l

---

221 = 2.5l + 113 - l
221 = 1.5l + 113
108 = 1.5l
72 = l

Now, substitute that back into the first equation:

l + r = 113
72 + r = 113
r = 41

Finally, check your work by substituting back into both equations:

72 + 41 = 113    -->    113 = 113    <-- True
221 = 2.5(72) + 41    -->    221 = 180 + 41    <--True

Answer:
Franklin sold 72 large bottle of water and 41 regular-sized bottles of water.
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