30.
									
										Two years ago the average age of the family of 8 members was 18 years. After the addition of a boy the average age of a family remains the same today. What is the age of the baby ?
									
								
															
														
																									
										A:
											2 years
									
																										
										B:
											9 years
									
																										
										C:
											8 years
									
																										
										D:
											None of these
									
																								 
							
																
									The answer is:
										A
									
								
														
							
								
								
							
							
							
								