In an examination, a student got thrice as many sums wrong as he got right. If he attended 120 problems in all, the number of problems incorrectly done is:
(1) 90
(2) 30
(3) 40
(4) 60
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In an examination, a student got thrice as many sums wrong as he got right. If he attended 120 problems in all, the number of problems incorrectly done is:
(1) 90
(2) 30
(3) 40
(4) 60
In an examination, a student got thrice as many sums wrong as he got right. If he attended 120 problems in all, the number of problems incorrectly done is:
(1) 90
(2) 30
(3) 40
(4) 60
Correct option is (1) 90