Question 189676
let the number of golds won by china and US be C and U respectively
:
C+U=67.......eq 1
U=C+3........eq 2
:
take U's value from eq 2 and plug it into eq 1
:
C+C+3=67
:
2C=64
:
C=32
:
U=C+3=32+3=35