Billu, Happy, Jerry and Tom appeared in a test in
which each of them scored distinct marks. The marks
scored by Happy were more than the sum of the marks
scored by Billu and Jerry. The sum of the marks scored
by Happy and Billu was equal to sum of the marks
scored by Tom and Jerry. The sum of the marks scored
by Happy and Jerry was less than the sum of the marks
scored by Tom and Billu. Who scored the least amongthe four?

I'll write the first letter of there names,, first H marks i s greater then the combined marks of (B+J),, this means H has scored more marks than B. & J

Second,, H+B = T+J

Third. H+J < T+B

so,, in first case When we combined B+H marks it becomes equal to other two
but in 2nd case H+j becomes smaller to the sum of other two that means,, B was a scored more number thats why it makes them equal,, and J scored less marks That's why there combined marks is less,, so jerry has scored least marks