What is 105,159 rounded to the nearest ten thousand

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Ineed i been stuck on this question since yesterday