what should be subtracted from the sum of7/8and4/7 to get 9/40
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Let the number be x.
(7/8+4/7)-x=9/40
49+32/56-x=9/40
81/56-x=9/40
x=81/56-9/40
x=405-63/280
=342/280
=171/140
(7/8+4/7)-x=9/40
49+32/56-x=9/40
81/56-x=9/40
x=81/56-9/40
x=405-63/280
=342/280
=171/140
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