Campus Maths Puzzle Numerical Ability Arithmetic

In a test, a student scores 2 marks for every correct answer and loses 0.5 marks for every wrong answer. A student attempts all the 100 questions and scores 120 marks. The number of questions he answered correctly was

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(68*2)-(32*0.5)=120.
Since he answered 68 questions correctly he gains(68*2) 136 and he answers remaining 32 wrongly so (32*0.5) 16.Therefore subtracting correct - wrong(136-16) we get 120.
5 years agoHelpfull: Yes(0) No(0)

let
x+y=100
y=100-x
now given
2x-0.5y=120
2x-0.5(100-x)=120
2x-50+0.5x=120
x=68
and
x+y=100
y=32
so, 2*68-0.5*32=120
68,32=ans
5 years agoHelpfull: Yes(0) No(0)

Campus Other Question

In a family, there are four daughters Aasha, Eesha, Trisha, and Usha. Each girl has exactly one necklace and one bracelet. Each of these eight ornaments was bought in either 2007, 2008, or 2009. The eight ornaments were bought in a manner consistent with the following conditions:

A. The necklace for each girl was bought either in an earlier year than or in the same year as the bracelet for that girl.
B. The necklace for Eesha and the bracelet for Aasha were bought in the same year.
The necklace for Trisha and the bracelet for Usha were bought in the same year.
C. The necklace for Eesha and the necklace for Trisha were bought in different years.
D. The necklace for Aasha and the bracelet for Trisha were bought in 2008. (37% of 2380)-(41% of 2115)=?