2 by 7 part of a certain sum was donated and 1 by 4 was spent on education . the balance amount will be
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Let the sum be Rs x .
Sum donated = 2x / 7
Spent on education = x /4
So ,
spent sum
= 2x / 7 + x / 4
= 8x + 7x / 28
= 15x / 28
Now ,
Left amount =
x - 15x / 28
= 28x - 15x / 28
= 13x / 28
that means ,
13 / 28 th part of sum will be left .
^_^
Sum donated = 2x / 7
Spent on education = x /4
So ,
spent sum
= 2x / 7 + x / 4
= 8x + 7x / 28
= 15x / 28
Now ,
Left amount =
x - 15x / 28
= 28x - 15x / 28
= 13x / 28
that means ,
13 / 28 th part of sum will be left .
^_^
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