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