Respuesta :
Trial and error
70=c+(c+20)
70=2c + 20
-20 -20
50=2c
÷2 ÷2
25=choco cookies
70-25=35
35=sugar cookies
CHECK....
25=35=70
It is correct
70=c+(c+20)
70=2c + 20
-20 -20
50=2c
÷2 ÷2
25=choco cookies
70-25=35
35=sugar cookies
CHECK....
25=35=70
It is correct
chocolate chip cookies sold=c
sugar cookies sold= s
c+20=s
c+s=70
c+c+20=70
2c+20=70
2c=50
c=25
25+20=45 sugar cookies
Just to check 45+25=70
She sold 45 sugar cookies
Hope this helps :)
sugar cookies sold= s
c+20=s
c+s=70
c+c+20=70
2c+20=70
2c=50
c=25
25+20=45 sugar cookies
Just to check 45+25=70
She sold 45 sugar cookies
Hope this helps :)