The average age of a family of 3 members was 25 years, five years ago. a new child was born due to which the average age of the family is 23 years today. what is the present age of that child?

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?