Question

(2+4+...+200):[(4+8+...+100):13]=

Answer 1

(2+4+......+200):[(4+8+......+100):13]
2(1+2+....+100):[4(1+2+....+25):13]
10100: [(2*25*26):13]
10100: (1300:13)
10100:100
101

Answer 2

(2+4+...200):[(4+8+...100):13]=
2(1+2+...100):[4(1+2+...25):13]=
2(100x101):2:[4(25x26):2:13]=
10100:(2x650:13)=
10100:(1300:13)=
10100:100=101