math whiz Quiz

Question Number 1 2n+n=27,n = A. 13 B. 12 C. 7 D. 9 Question Number 2 2400+500= A. 3050 B. 2900 C. 1600 D. 2500 Question Number 3 What is 100+47 A. 1047 B. 104.7 C. 10047 D. 100.47 Question Number 4 what is 15+15 when doubled A. 30 B. 90 C. 60 D. 300