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Norma-Jean [14]
2 years ago
10

An English essay must

Mathematics
2 answers:
garik1379 [7]2 years ago
8 0

Answer:

78

Step-by-step explanation:

250 - 172 = 78

Pachacha [2.7K]2 years ago
5 0
78 because 250-172 is 78
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A textbook store sold a combined total of 438 biology and psychology textbooks in a week. The number of psychology textbooks sol
Liono4ka [1.6K]
<h2>Answer:</h2>

Number of biology textbooks sold: 257 textbooks

Number of psychology textbooks sold:​ 181 textbooks

<h2>Explanations:</h2>

Let the total number of biology textbook sold be "a"

Let the total number of psychology textbook sold be "b"

If a textbook store sold a combined total of 438 biology and psychology textbooks in a week, then:

a + b = 438 ................... 1

If the number of psychology textbooks sold was 76 less than the number of biology textbooks sold, then;

b = a - 76 ...................... 2

Substitute equation 2 into 1

a + (a-76) = 438

a + a - 76 = 438

2a = 438 + 76

2a = 514

a = 514/2

a = 257 biology textbooks

From equation 2;

b = a - 76

b = 257 - 76

b = 181 psychology textbooks

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Number of psychology textbooks sold:​ 181 textbooks

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1 year ago
If a sample of 58 runners were taken from a population of 302 runners
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302

Step-by-step explanation:

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There were a number of people at a conference. After 19 people went home, 23
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