Question

5+15+25+35+45+55+65+75+85+95=?????????

Answer 1

= ( 5 + 95 ) + ( 15 + 85 ) + ( 25 + 75 ) + ( 35 + 65 ) + ( 45 + 55 )

= 100 + 100 + 100 + 100 + 100

= 5 x 100

= 500