Helen can write 15 postcards in one hour, while Kate can write 20 postcards. How much longer would Helen take to write 300
postcards than Kate?
__ hours

Dis the

The purpose of a lab is to do your "expirements" the importance of the topic is so you can now what the story is about and the last one is because no one is me with my question ( what is 3 over 4 x - 9 = 27 maybe you can )

Ithink it’s 98 because jajajjajansmsmjs