Question

Calculati numarul X stiind ca a - b = 6 si :
a ) X + 3 * a - 3 * b = 20
b) X * a - x * b + 9a - 9b = 654
c ) 7 * a - 7 * b + X = 55
d ) 13 + X - ( 5 * a - 5 * b ) = 2011

Answer 1

a) x + 3(a -b) = 20
x + 18 = 20
x = 2

b) x(a - b) + 9(a - b) = 654
6x + 54 = 654
6x = 600
x = 100

c) 7(a - b) + x = 55
42 + x = 55
x = 55 - 42 = 13

d) 13 +x -5(a - b) = 2011
13 + x - 30 = 2011
x = 2011 + 17 = 2028