Ex 4.4, 2 Solve the following: (a) The teacher tells the class that the highest marks obtained by a student in her class is twice the lowest marks plus 7. The highest score is 87. What is the lowest score?Let lowest marks = x
Given that,
Highest marks = twice the lower marks plus 7
Highest marks = 2x + 7
Also,
Highest marks = 87
Thus,
2x + 7 = 87
2x = 87 − 7
2x = 80
x = 80/2
x = 40
∴ Lowest marks = 40

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.