13/18 used common denominator of 90 so 2/9 x 10 and 1/6 x 15 gave me 20/90 and 15/90. Added those and cane up with 35/90. Difference was 65/90 so but could be divided by 5 so my answer came out to 13/18.
Wait wouldn't you only subtract the numbers so it would be 240000-60000 I'm not really sure I'm not the best with math so don't take my word for it I'm sorry if I did it wrong
