a + a + a + a + a + b + b + b + b + b
= ( a + b ) + ( a + b ) + ( a + b ) + ( a + b ) + ( a + b )
= 105 + 105 + 105 + 105 + 105
= 105 x 5
= 525
a + a + a + a + a + b + b + b + b + b
=( a + b ) + ( a + b ) + ( a + b ) + (a + b ) + ( a + b )
= 105 + 105 + 105 + 105 + 105
= 525