I finished the 5lb chapter on ratios with pretty much no issues except for this question which I just can’t wrap my head around. I think the relationships between the coins/ different currencies is confusing me but I’m not sure.

I also don’t find it useful to put the currency into “something familiar” like dollars as suggested by the 5lb book solution explanation.

Yeah I remember this problem, those coin names were annoying and confusing me
My personal strategy is that if I am not able to understand a question in first two readings, I just note down what is given in the question and see where my destiny takes me:) So:

10 terble = 1 galok

6 barbar = 1 murb

Also given, galok = 40% more than murb = 1.4 x murb

But murb = 6 barbar

Thus, galok = 1.4 x 6 barbar …(1)

Also given, 1 galok = 10 terble

Thus we can write equation (1) as 10 terble = 1.4 x 6 barbar

Taking barber to LHS and 10 to RHS we get,

terble/barbar = 1.4 x 6/10 = 14 x 6/100 = 84/100 = 21/25

Thus option (E) 21/25 is the correct answer. Cheers!

(g=galok, t=terble, b=barbar, m=murb)
1g=10t
6b=1m
Now, 1g=1.4m , therefore 10t=14m=8.4b.
so you have to compare 10t to 8.4b. so 1t=0.84b. Use your calculator and look which fraction gives you exactly 0.84. It’s answer E