Question

(?+?):7=2+8 (20+12):?
(46+18):8=?+3 =20:4+?
(30+?):6=30:6+2 (20+42): 7=4+? (?+?):2=2+4

Answer 1

(с+с)÷=200+120:с
2с÷с=320
1с=320
с=320

(48+18)÷8=к+3=20÷4+к
8,25=3+к=5+к
к=8.25-3
к=5.25
8,25=3+5,25=5+к
к=8.25-5
к=3,25
8,25=3+5,25=5+3,25
8,25=8,25=8,25