The correct option, if speeds of gamma rays, X-rays and

?% of 18% of 2600 = 234

26% of 650 + 15% of 660 – 26% of 450 = ?

56 x 8 – 65% of 40 = ? + 14 x √625

25% of 140 + 2 × 8 = ? + 9 × 5

Solve the following:

523 + 523 x 523 ÷ 523

215 + 378 – 23 + 15 - 27 = ? + 3² + 16²

[∛(3375/19683  )- ∛(125/1728  )  ] ÷ ∛(64/729)  = ? - 3/8 

√225 + 27 × 10 + ? = 320

20 + 160/? × 20 = 420

If (i) P is taller than Q, (ii) R is shorter than P, (iii) S is taller than T but shorter than Q, then who among them is the tallest?