435,506 rounded to nearest ten thousand

Me with this one question, and i'll upvote the brainliest answer

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers