Question 839225
{{{A/B=7/8}}}
1.{{{8A=7B}}}
2.{{{A+B=105}}}
{{{8A+8B=840}}}
Substituting from eq. 1,
{{{7B+8B=840}}}
{{{15B=840}}}
{{{B=56}}}
Then from eq. 2,
{{{A=105-56}}}
{{{A=49}}}