In a gathering of 100 people, 70 of them can speak Hindi, 60 can speak English and 30 can speak French. Further, 30 of them can speak both Hindi and English, 20 can speak both Hindi and French. If x is the number of people who can speak both English and French, then which one of the following is correct? (Assume that everyone can speak at least one of the three languages.)
A person goes to a market between 4 p.m. and 5 p.m. When he comes back, he finds that the hour hand and the minute hand of the clock have interchanged their positions. For how much time (approximately) was he out of his house
There are three brothers. The sums of ages of two of them at a time are 4 years, 6 years and 8 years. The age difference between the eldest and the youngest is
Consider the following in respect of natural numbers a, b and c :
Which of the above are correct
The value of k, for which the system of equations 3x-ky-20=0 and 6x-10y+40 = 0 has no solution, is
Which of the points P(5,-1), Q(3,-2), and R(1,1) lie in the solution of the system of inequations x+y≤4 and x-y≥2
