in certain office, betty can type twice as many words per minute as annie. cindy can type 80 more words tha annie. if the three can type 600 words per minute. how fast can each girl type?

Question

lieutenantgeneral · Answer

600 divided by 80 = 7.5

mathmale · Answer

Keep in mind that all of these data represent rates (that is, how many words per minute each girl (individually) and all three girls (jointly) can type.

Sounds like the basic rate is Annie's:  Let's say that her typing speed is a words per minute.

Since Betty can type twice as many words per minute as can Annie, her rate is 2a words per minute.

Cindy can type 80 more words per minute than Annie can.  Thus, her typing speed is a+80.

Together the 3 girls can type a total of 600 words per minute.

Set up an equation and solve it for a.

Then find Betty's and Cindy's respective typing speeds.

anonymous · Answer

ok thank you for the help :)

anonymous · Answer

jake is nine years older than leth. three years ago, jake was twice as old as leth, how old are the two?

mathmale · Answer

Please, would you post new questions separately?  Thanks.