Question

Ce numar si-a ales George daca il aduna cu 7 , inmulteste suma cu 9 , adauga la produs 3 si de 3 ori scade 149 , imparte la 100 diferenta si obtine 4 .

Answer 1

{[( x + 7 ) × 9 + 3] - 3 × 149} ÷ 100 = 4 <=>
[( x + 7 ) × 9 + 3] - 3 × 149 = 400 <=> 
( x + 7 ) × 9 + 3 = 847 <=>
( x + 7 ) × 9 = 844 <=>
x + 7 = 93,(7) <=>
x = 86,(7) ;

Bafta !

Answer 2

 {[(a+7)x9]+3-149x3}:100=4
 {[ 9a+63]+3-447}:100=4
{9a+63+3-447}:100=4
9a+66-447/100=4
900a+6600-44700=400
900a=400+44700-6600
900a=38500
a=42.78