Answer:
 4.9 Guilders
Step-by-step explanation:
Data:
 Available Guilders = 11
 Exchange Rate = 2.7 Guilders = 1.2 Florins
Solution:
 As we know,
 2.7 Guilders are equal to = 1.2 Florins
Then,
 11 Guilders will be equal to = X Florins
Solving for X,
  X  = (11 Guilders × 1.2 Florins) ÷ 2.7 Guilders
  X  = 4.8888889 Guilders
Or rounded to two significant figures,
  X  = 4.9 Guilders