求助2道gwd数学题！！

mmccgood

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?



A.424

B.433

C.440

D.449

E.467
答案是c，不知道这题目是什么意思，请指教！
Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?

(1)She bought $4.40 worth of stamps.

(2)She bought an equal number of $0.15 stamps and $0.29 stamps.

答案是d，我就不懂了（2）只说说了0.15和0.29的邮票买的一样多，怎么可能回答How many ？是不是答案有问题啊，请指点


Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?

(1)She bought $4.40 worth of stamps.

(2)She bought an equal number of $0.15 stamps and $0.29 stamps.

答案是d，我就不懂了（2）只说说了0.15和0.29的邮票买的一样多，怎么可能回答How many ？是不是答案有问题啊，请指点

wyw1018

10^50 - 74 = 99999...999926 其中26之前共有48个9 数字总和为：48*9+2+6 = 440

tinyhuhu

ls正解

wyw1018

第二题答案应该是a

gmat考750

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?



A.424

B.433

C.440

D.449

E.467
答案是c，不知道这题目是什么意思，请指教！
Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?

(1)She bought $4.40 worth of stamps.

(2)She bought an equal number of $0.15 stamps and $0.29 stamps.

答案是d，我就不懂了（2）只说说了0.15和0.29的邮票买的一样多，怎么可能回答How many ？是不是答案有问题啊，请指点


Joanna bought only $0.15 stamps and $0.29 stamps.How many $0.15 stamps did she buy?

(1)She bought $4.40 worth of stamps.

(2)She bought an equal number of $0.15 stamps and $0.29 stamps.

答案是d，我就不懂了（2）只说说了0.15和0.29的邮票买的一样多，怎么可能回答How many ？是不是答案有问题啊，请指点

-- by 会员 mmccgood (2011/8/22 15:26:08)

第一题解答见2楼，第二题答案是A，OG原题

mmccgood

谢谢各位帮助，没看懂这句话in base 10 notation，原来不影响，不胜感激