1) Maria is 6 times as old as Tina. In twenty years, Maria will be only twice as old as Tina. How old is Maria now?

Question

Please explain how you got your answer. Thanks!

2)
Rating. Relative speed of flow
10W. Half as fast as 5W
15W. Half as fast as 10W
20W. Half as fast as 15W

2) According to the table above, car engine oil with a rating of 5W flows how many times as fast as car engine oil with a rating of 20W?

3) Ti and G both collect stamps. The number of stamps in Ti collection is 3 less than 5 times the number of G's collection

A How many number of stamps are in Tina's collection?
***T=5G-3***
B The number of stamps in G's collection
***J***

Answer choices-
D) Answer A is bigger
L) answer B is bigger
S) answers are the same
T) Relationshio can not be determined ***

Answer 1

1)
m = 6t
m+20 = 2(t+20)
6t+20 = 2t+40
t=5
So, Mary is 30
in 20 years she will be 50, which is 2*25

2)5W = 2*10W = 4*15W = 8*20W

3) makes no sense, either the question of the answers