Ex 1.1, 2 In a quiz, positive marks are given for correct answers & negative marks are given for incorrect answers. If Jack s scores in five successive rounds were 25, 5, 10, 15 &10, what was his total at the end?
Rough
+ & becomes
+ & + becomes +
& becomes +
Total score = 25 + ( 5) + ( 10) + 15 +10
= 25 5 10 + 15 + 10
= (25 + 15 + 10) 5 10
= 50 5 10
= 50 (5 + 10)
= 50 15
= 35
His total was 35

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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.