Answer: 17.5
Step-by-step explanation: solve following the rules of PEDMAS
Work out figures enclosed in parentheses
(16x24) = 384
384 x 280/? = 107520
Equate the result to 6144
107520/? = 6144
Multiply through by ?
107520 = 6144?
? = 107520/6144
? = 17.5