How many such pairs of letters are there in the words

I. p² – 5p + 6 = 0                  

II. 36q² = 81

Solve: (x/3) + (x/5) = 16

 If the point of intersection of the lines 2x + y = 11 and x - y = 1 is P(a, b), then the value of a + 2b is:

Solve for x: 5x − 7 = 3x + 9

For given pair of equations, how many solutions are possible?

3x + 4y = 15 and 6x + 8y = 10

For given pair of equations, how many solutions are possible?

2x + 3y = 10 and 4x + 5y = 18

Solve: 2x + 3y = 19 and x − y = 2, Find x and y

The ratio of roots of the equation mx² + nx + n = 0 is α/ β = a/b, then find the value of `sqrt(a/b)+sqrt(b/a)+sqrt(n/m)`

For given pair of equations, how many solutions are possible?

4x + 6y = 16 and 8x + 12y = 32

If (5√P - 7√Q) = 5, [1.5P = 4Q-(R/3)+9] and (√P/√Q) = 1.6, then find out the value of ‘R’.