find the value of 16 log 5 base 4

11.18

here log5 base4 can be written as log5 base 10/log4 base 10so value of log 5 is 0.699 and of log 4 is 0.602dividing log 5 by log 4 we get 1.16now multiplying 1.16 by 16 as giving in question we get answer=18.56so 18.56 is answer