Jennifer made 70 cookies to sell to her friends. She sold 20 more sugar cookies than chocolate chip cookies. If all of the cookies were sold, how many were sugar cookies?
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
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 :)