25 + 23 + 32 + 35 + 53 + 52 = 220
25 +23 + 32 + 35 + 53 + 52 = ( 25 + 35) + ( 23 + 53) + ( 32+ 52)
= 60 + 76 + 84
= 60 + ( 76 + 84)
= 60 + 160
= 220
25+23+32+35+53+52
= ( 25 + 35 ) + ( 23+52 ) +( 32+53 )
= 50 + 75 + 85
= 50 + ( 75+85)
= 50+ 160
= 210