Question 260335
Let the total amount be T
So, we get
(i) {{{(1/4)T + (1/2)T + 20 + 10 = T}}}
multiply by 4 to get
(ii) {{{T + 2T + 120 = 4T}}}
subtract 3T to get
(iii) {{{120 = T}}}
This means we have 
60 fighters.