If x2 - xy + y2 =2 and x4 + x2y2 + y4 = 6, then the value of x2 + xy + y2 is:
The average of 20 numbers is calculated as 35. It is discovered later on that while calculating the average, one number, namely 85, was read as 45. The correct average is
The difference between two numbers is 9 and the difference between their squares is 207. The numbers are
Which of the following relations is correct for
The mid points of AB and AC of a triangle ABC are respectively X & Y. If BC + XY = 12 units, then the value of BC - XY is:
∆ABC is an isosceles triangle with AB = AC = 15 cm and altitude from A on BC is 12 cm. Length of side BC is
