请教OG11上一道DS数学题P24->27

27. If the length of Wanda's telephone call was rounded up to the nearest whole minute by her telephone company, then Wanda was charged for how many minutes for her telephone call?

(1) The total charge for Wanda's telephone call was $6.50

(2)Wanda was charged $0.50 more for the first minute of the telephone call than for each minute after the first

请问题目中的was rounded up to是什么意思？这个题目看不太懂