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How old will Jacob be when his brother is twice as old as he is now? Explain your thinking.

Here's who has answered correctly so far:

Lark T.                  Madison W.           Alison F.            Avery S.

Paige D.              Andy L.                  David S.            Mikey H.

Moria S.               Olivia G.                Ben C.               Matthew K.

Ari R.                    Henry T.                 Peter A.              Zach K.

Sarah R.             Liza B.                      Mika K.               Rodrigo L.

Eric S.                 Michael W.             Katie K.              Caroline A.

Erin P.                 Ava C.                      Rian N.              Ethan B.

Emily B.             Abby L.                     Forrest T.            Miles R.

Andrea L.          Elizabeth W.            Andrew B.        Evan B.

Max N.              Josh D.                      Ben S.                   Lily C-I

James D.          Sam S.                      Jesse P.                Caroline B.

Maggie S.        Michael D.               Finn S.                  J.R.

Conor F.           Brad G.                      Liam S.                 Kyla W.

Catherine Y.    Alexandre A.          Lara M.                 Amanda G.

Kristina K.          Anna E.                   Jody F.                  Dan B.

Greg A.             Rachel                    T-Bone                   Chris G.

Marilyn             Marilyn                   Christine B.          Hailey B.

Alison S.