Question

I need help with the ones withe the little marks by them​

Answer 1

Representing the situation:

9. n + 12n = 91

18. n + 10n = 99

20. 12n +3 = 135

21. 8(n+7) = 104

26. 2(n+43) = 94

27. 60 + n = 132

Solving the equation:

9. n + 12n = 91

13n = 91

n = 91/13

n = 7

18. n + 10n = 99

11n = 99

n = 99/11

n = 9

20. 12n +3 = 135

12n = 132

n = 132/12

n = 11

21. 8(n+7) = 104

8n + 56 = 104

8n = 48

n = 6

26. 2(n+43) = 94

2n + 86 = 94

2n = 8

n = 4

27. 60 + n = 132

n = 72