Math Riddles

Question: There are 6 sisters. Each sister has 1 brother. How many brothers are in the sisters' family?

Question: How much does the brick weigh if a brick weighs 1kg plus a half brick?

Question: Nathan has math 4 times a week. If he has math 8:00 Monday, 9:20 on Tuesday, 10:40 on Wednesday, and 1:20 on Friday, when does Nathan have math on Thursday?

Question: Which triangle will have a larger perimeter : 3,4,5 or 3,4,7 ?

Question: what are the next two letters in this sequence: A, E, F, H, I, K, L, M,