maths wiz Quiz

Question Number 1 10x+7=20 A. 23 B. 20 C. 1.0005 D. 2.3 Question Number 2 the avg age of 5 girls is 12 if the avg age of 1st 4 is 11.25 what is the age of the 5 girl? A. 13 B. 8 C. 14 D. 16