Answer:
1. Harriet gets less pie than Jeff. Both groups have four pies, but Harriet is with a group of five children, meaning each child will receive 4/5 of a pie, while Jeff is with a group of seven children, meaning each child will receive 4/7 of a pie. Therefore, Jeff gets more pie than Harriet.
2. Jeff gets less pie than Jean. Both groups have seven children but Jean's group has six pies, meaning each child will receive 6/7 of a pie, while Jeff's group has four pies, meaning each child will receive 4/7 of a pie. Therefore, Jean gets more pie than Jeff.
3. Harriet gets less pie than Jean. Harriet's group has five children sharing four pies, meaning each child will receive 4/5 of a pie, while Jean's group has seven children sharing six pies, meaning each child will receive 6/7 of a pie. Therefore, Jean gets more pie than Harriet.