Let m and j be the current ages of Matthew and Jenny, respectively.
Now, Matthew is 3 times as old as Jenny, so the variables are in the following relation:

In 7 years, both of them will be 7 years older, i.e. their ages will be m+7 and j+7, and Matthew will be twice as old:

Now, remembering that m=3j, we can rewrite the second equation as

So, Jenny is 7 and Matthew is 21 (he's 3 times older).
In fact, in 7 years, they will be 14 and 28, and Matthew will be twice as old.
Answer:
n^22 (I love your profile picture by the way)
Step-by-step explanation:
48000 ounces is the weight of the hippo
Divide 2106 by 27 = 78
78 is the answer
The congruence theorem that you can use is AAS because you can see from the image that 2 angles and 1 side are equal. AAS(angle angle side)