31. The diagonal of a square is 4√2cm. The diagonal is another square whose area is double that of the first square is__________?
A. 8cm
B. 8√2cm
C. 16cm
D. 4√2cm
✅ The correct answer is option A. 8cm.
Mathematics
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32. The average salary of workers in an industry is Rs.200 the average salary of technicians being Rs.400 and that of non-technicians being Rs.125. What is the total number of workers?
A. 250
B. 275
C. 550
D. 400
✅ The correct answer is option C. 550.
33. The speed of a boat in upstream is 60 kmph and the speed of the boat downstream is 80 kmph. Find the speed of the boat in still water and the speed of the stream?
A. 70, 10 kmph
B. 35, 27 kmph
C. 50, 60 kmph
D. 45, 55 kmph
✅ The correct answer is option A. 70, 10 kmph.
34. (830 + ? * 3 * 14 / 100) – (830 * 14 * 3 / 100) = 20.16
A. 24
B. 36
C. 48
D. None of these
✅ The correct answer is option D. None of these.
35. 15 men can build a 500m long wall in 30 days. In how many days can 30 men build a 1.2 km long wall?
A. 48 days
B. 24 days
C. 40 days
D. 36 days
✅ The correct answer is option D. 36 days.
No. of days is
No. of days is
directly proportional to the length of the wall and
inversely proportional to the number of men No. of days = (1200/500)*(15/30)*30 = 36 days
36. Seats for Mathematics, Physics and Biology in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats ?
A. 2 : 3 : 4
B. 6 : 7 : 8
C. 6 : 8 : 9
D. None of these
✅ The correct answer is option A. 2 : 3 : 4.
5:7:8 = 50:70:80
5:7:8 = 50:70:80
50*140/100=70 ; 70*150/100=105 ; 80*175/100=140
70: 105: 140 or
14: 21: 28 or
2: 3: 4
37. If the length and width of a rectangular grand are each increased by 20% then what would be the percent increase in the area of the garden?
A. 20%
B. 24%
C. 36%
D. 44%
✅ The correct answer is option D. 44%.
38. The sum of four consecutive even numbers is 292. What would be the smallest number?
A. 74
B. 76
C. 70
D. 68
✅ The correct answer is option C. 70.
Let the four consecutive even numbers be 2(x – 2), 2(x – 1), 2x, 2(x + 1)
Let the four consecutive even numbers be 2(x – 2), 2(x – 1), 2x, 2(x + 1)
Their sum = 8x – 4 = 292 => x = 37
Smallest number is: 2(x – 2) = 70.
39. A lends Rs. 1500 to B and a certain sum to C at the same time at 8% per annum simple interest. If after 4 years, A altogether receives Rs. 1400 as interest from B and C, then the sum lent to C is________?
A. Rs.2875
B. Rs.1885
C. Rs.2245
D. Rs.2615
✅ The correct answer is option A. Rs.2875.
40. A discount series of 10%, 20% and 40% is equal to a single discount of:_________?
A. 50%
B. 56.8%
C. 60%
D. 70.28%
✅ The correct answer is option B. 56.8%.