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Let the no. Be x
Equation formed is
(4x/7)+18=x
4x/7=x-18
4x=7x-126
-3x=-126
X=42

four seventh of the no = 4/7 of x

= (4/7)×x

= 4x/7

According to the question

x = 4x/7 + 18

⇒ x - 4x/7 = 18

⇒ (7x - 4x)/7 = 18

⇒ 3x/7 = 18

⇒ 3x = 18×7

⇒ 3x = 126

⇒ x = 126/3

∴ x = 42

∴The no is 42