(643-y)*2=1512:4 и (300:х+19)*32=992

Question

(643-y)*2=1512:4 и (300:х+19)*32=992

Answer 1

(643-у)*2=1512:4
(643-у)*2=378
643-у=378:2
643-у=189
у=643-189
у=454

(300:х+19)*32=992
(300:х+19)=992:32
300:х+19=31
300:х=31-19
300:х=12
х=300:12
х=25