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Mandarinka [93]
2 years ago
6

How many minutes make a hour

Mathematics
2 answers:
vaieri [72.5K]2 years ago
8 0
60 minutes equal a hour
Ede4ka [16]2 years ago
7 0

Answer:

60 minutes make an hour

Step-by-step explanation:

Because 1 hour = 60 minutes

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A bag of rice weighs 2.5 pounds. How many ounces is that?
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Cho khối chóp có diện tích đáy B=3 và chiều cao h=4. Thể tích của khối chóp đã cho bằng
lyudmila [28]

Answer:

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Step-by-step explanation:

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4 0
2 years ago
19. The present age of brother and sister are in the ration 4:5 Before three years the ration of their age was 3:4. find their p
Lyrx [107]

Answer:

Sister = 15 years old

Brother = 12 years old

Step-by-step explanation:

Right now, if the brother is B years old and the sister is S years old, B = (4/5)S because the ratio from brother to sister is 4:5, so if one unit is X, B = 4X and S = 5X

Three years ago, the brother was B-3 years old and the sister was S-3 years old. Keeping one unit as X, we have

B = 3X

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Therefore, we have a system of equations

B = (4/5)S

B-3 = (3/4)(S-3)

Substitute (4/5)S for B into the second equation to only have one variable

(4/5)S - 3 = (3/4)(S-3)

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add 3 to both sides and subtract (3/4)S from both sides to isolate the variable and its coefficient

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multiply both sides by 20 to isolate the S

S = 15

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5 0
2 years ago
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