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Zwelibanzi and Jessica are friends. Zwelibanzi takes Jessica’s civil technology test paper and will not tell her what her mark is. He knows Jessica dislikes word problems so he decides to tease her. Zwelibanzi says: : I have 12 marks more than you do and the sum of both our marks are equal to 148. What are our marks?

Respuesta :

mhanifa

Answer:

80 and 68

Step-by-step explanation:

Jessica's marks = x

Zwelibanzi's marks = y

We get following equations as per given:

  • y - x = 12
  • y + x = 148

Sum up the two equations to substitute x:

  • 2y = 12+148
  • 2y = 160
  • y = 160/2
  • y = 80

And finding the value of x:

  • x = y -12
  • x = 80 -12
  • x = 68

Marks are: 80 and 68

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