a petrol tank is 5/8 full. After 180 have been drawn of its one sixth full. what is the capacity of the tank??????

Let x be the tank's capacity.......And the difference between being 5/8ths full and 1/6th full is 180 (gallons??)

So

(5/8)x - (1/6)x = 180

(30 - 8)x /48 = 180

(22/48)x = 180     multiply both sides by 48/22

x = (48.22)180 = about 392.72 (gallons??)

thanks phil