3 ms·
I think it’s easier to see if you drop the time indices and just introduce a variable for the elapsed time. So: Mary := 24 = 2(A - Δ) A = Mary - Δ And then i
by bayesnet 2mo ago
I think it’s easier to see if you drop the time indices and just introduce a variable for the elapsed time. So:
Mary := 24 = 2(A - Δ)
A = Mary - Δ
And then it’s just substitution. But of course what appeals to one’s intuition is very personal
- HarHarVeryFunny 2mo agoTo me, explicitly representing the two pairs of ages (now: M, A; previously: M', A') is simpler because it let's you directly represent the problem statement without any mental gymnastics whatsoever. M = 2A' "Mary is [now] twice as old as Ann was ..." M'= A "when Mary was as old as Ann is now"