 
<translate> Teresa tana da fensir 49 domin 14 + 35 = 49. Teresa ta ba da alkalami 39 domin 49 - 10 = 39. Kowane ɗan'uwa yana samun fensir 13 domin 39 / 3 = 13. Saboda haka, amsar ita ce 13. <eng> Teresa has 49 pencils because 14 + 35 = 49. Teresa gives away 39 pencils because 49 - 10 = 39. Each sibling gets 13 pencils because 39 / 3 = 13.
Therefore, the answer is 13. 