Question

If 9:a::a:16, then a is
(a) 12 (b) 144 (c)16 (d) 9

Answer 1

(a) 12

Step-by-step explanation:

9:a::a:16

9/a=a/16

9×16=a×a

144=a^{2}

\sqrt{144} =a

12=a

a=12