what is 7/8 minus 2/5?

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LCM of 8 and 5 is 40 so the fractions can be expressed in fortieths: 7/8=5*7/(5*8)=35/40 and 2/5=8*2/(8*5)=16/40. Now the fractions can be subtracted: (35-16)/40=19/40.

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