PP-T1-PS81

[Huang Hsin-Yi]

81. 9215-!-item-!-187;#058&006304
If each term in the sum a1 + a2 + . . . + an is either 7 or 77 and the sum equals 350, which of the following could be equal to n ?

(A) 38
(B) 39
(C) 40
(D) 41
(E) 42

Ans:C

[amyliang]

http://www.formosamba.com/phpBB3/viewtopi ... equals+350

[amyliang]

Dear Huang Hsin-Yi
這題你看懂了嗎??? 今天做題時 不知道為什麼 一直想不起來 a+11b=50這個東西是怎麼來的，可以請你解釋一下嗎???

[smilego]

7a+77b=350
每個除以7就是a+11b=50