Well, if 7 men have 7 wives, that means they have one wife each so that will be 7 + 7 = 14. Then, each wife has 7 children, so that will be 7 x 7 = 49. Next we add the children to the men and wives and get 49 + 14 = 63. So the total number of people is 63.
Don’t know if this is what you meant
Hope I understood it right and helped!