self Maths Puzzle

(0.04)-1.5 = ?

A. 25 B. 125
C. 250 D. 625

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self Other Question

25)7.5 x (5)2.5 รท (125)1.5 = 5?

A. 8.5 B. 13
C. 16 D. 17.5

(243)n/5 x 32n + 1 = ?
9n x 3n - 1


A. 1 B. 2
C. 9 D. 3n