I have been given this question: Sam’s last two times for the $10,000$ metres added up to $71.4$ minutes. Her second time was $10\%$ slower than her first. Next season Sam wants to improve her first time by $5\%$
I evaluated in this way:
1st try = $x$
2nd try = $y$
$y = x+10\%$
THEREFORE - I think my formula to evaluate should be: $x+(x+10\%)=71.4$
I think this evaluates to $x = 35.65$ minutes SO - when I then take $x+10\%$ I get $39.215$ and this should be $Y$.
BUT $35.65 + 39.215 = 74.865$
What am I doing wrong?