Question 600399
Two squares 

small square ---side = s

Area ={{{ s^2}}}

Larger square side = 6s

area ={{{ (6s)^2}}}

area = {{{36s^2}}}

{{{36s^2+s^2= 148}}}

{{{37s^2=148}}}

/37

{{{s^2= 148/37}}}

{{{s^2= 4}}}

s= +/-2

ignore negative since length cannot be negative

side of smaller square = 2m

Length of side of bigger square = 6 *2 = 12m

Check

Total area = 2^2+ 12^2=148