An engineering student has to secure 25% marks to pass. He gets 47 and fails by 43 marks. What are the maximum marks of the examination?
1). 385 marks
2). 410 marks
3). 360 marks
4). 435 marks
If a - b = -7 and $a^2 + b^2$ = 85, then find ab.
1). 18
2). -30
3). -44
4). -60
In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average
weight of the boys of the class?
1). 72
2). 73
3). 69
4). 71
Of the four numbers whose average is 91, the first is 3/10 times the sum of other three. The first number is:
1). 126
2). 56
3). 168
4). 84
Which of the following equations has the sum of its roots as 5?
1). $x^{2}$ -5x + 6=0
2). $x^{2}$ -5x - 6=0
3). $x^{2}$ +5x + 6=0
4). $x^{2}$ +5x - 6=0