Y’all should help me I don’t understand

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section