[問題]GWD2 GMAT-Q20

[chloemoney]

Q20
A collection of 36 cards consists of 4 sets of 9 cards each. The 9 cards in each set are number1 through 9. If one card has been removed from the collection, what is the number on that card?
(1) The units digit of the sum of the numbers on the remaining 35 cards is 6.
(2) The sum of the numbers on the remaining 35 cards is 176

請問一下(1)為什麼充份呢？

[DARY]

Q20
A collection of 36 cards consists of 4 sets of 9 cards each. The 9 cards in each set are number1 through 9. If one card has been removed from the collection, what is the number on that card?
(1) The units digit of the sum of the numbers on the remaining 35 cards is 6.
(2) The sum of the numbers on the remaining 35 cards is 176

請問一下(1)為什麼充份呢？

題目：有4組編號1-9的卡片共36張，隨機抽出一張，可否知道编號是多少的上片

36張的和是(1+2+3...+9)*4=180，個位數是"0"
現在抽掉一張，號碼假設是x (1<= x <=9)
35張的和是180-x
第一個條件：180-x的個位數為6, x=4 , 充份
第二個條件：180-x=176 , x=4, 充份

答案(D)

[chloemoney]

哦...原來這麼容昜呀..
我了了，謝謝哦！