Explanation:

Quantity 1:

Let the score of Ajay = x

then, Rahul’s score = x – 15

and, Manish’s score = x – 25

According to the question,

Ajay’s score = 63 + 30 = 93

Hence, Rahul’s score = 93 – 15 = 78

Manish’s score = 93 – 25 = 68

Total marks of Rahul, Manish & Suresh = 63 x 3 = 189

Then, Suresh’s score = 189 – (78 + 68) = 43

The sum of Manish’s and Suresh’s scores = 68 + 43 = 111

Quantity 2:

400 person complete 1/4th of the work in 9×10 hours = 90 hours

= 400 person complete the work in 90 × 4 = 360 hours

=1 person completes the work in 360 × 400 hours

Let the number of persons completing the work in 20 days be x.

Remaining work to be done = 1 – 1/4 = 3/4

x person complete 3/(4 ) th of the work in 8×20 hours = 160 hours

= x person complete the work in 160×4/3 hours

= 1 person completes the work in 160×4/3×x hours

Time taken by 1 person to complete the work in both the cases will be same

So, 360 × 400 = 160×4/3×x

x = 675

So additional people required to complete the remaining work = 675 – 400 = 275

Hence Quantity I < Quantity II

Hence, option 5 is the correct answer.