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2. There are 56 pupils in a class. Thirty-six of them joined the field trip. Write
an equation to find the number of pupils who did not join the field trip.​

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at_answer_text_math:

18. A. 56 - 36 = 20

19. B. 8

20. C. 20 women and 10 men

at_explanation_text_math:

Step-by-step explanation:

x + 36 = 56

x = 56 - 36

56 - 36 = x

56 - 36 = 20

let y be previous average

let x be 7th number

(6y + x) ÷ 7 = 14

[6(15) + x] ÷ 7 = 14

90 + x = 14 × 7

x = 98 - 90

x = 8

let men be x

let women be 2x

2x + x = 30

3x = 30

3x/3 = 30/3

x = 10 men

2x

2(10)

= 20 women

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