If you're seriously not getting this
When he was 4 she was half his age, that means she was (4:2=) 2. So she is only two years younger than him. Therefore, now that he is 100 she is (100-2=) 98 years old.

I dont think you need to be a "genius" to crack it tho. I see many know it already, but explained for others:
If the sister was half his age when he was four, it means she was two, hence she is only two years younger.
100 - 2 = 98.

Most people would say 50 because they just quickly looked at the problem. I did that at first, then I looked over the problem one more time and solved it.

Well, I mean in theory, if his sister was, say, in space traveling faster than the speed of light, special relativity suggests that she could possibly be only 50 by her own accounting.

deleted· 8 years ago · FIRSTevarno· 8 years agoplz

1 moar

deleted· 8 years agoguest· 8 years agoTres moar

timebender25· 4 years agodr_richard_ew· 4 years agoshurikkaru· 4 years agoDownvote it

guest· 8 years agodeleted· 8 years agobiscuit0883· 8 years agomeowiamacat· 8 years agotraigeide· 8 years agomewlingquim· 8 years agoThat is not true

When I was that age I could

very easily

Not bragging

just saying

Your facts aren't straight

ivolunteerastribut· 8 years agoshurikkaru· 8 years agomeowiamacat· 8 years agoshurikkaru· 8 years agochrysaninja· 8 years agoshurikkaru· 8 years agoshurikkaru· 8 years agomeowiamacat· 8 years agojimbles_notronbo· 8 years agojimbles_notronbo· 8 years agoawesomelynerdy· 8 years agojimbles_notronbo· 8 years agogodzilla463· 8 years agochrysaninja· 8 years agoWhen he was 4 she was half his age, that means she was (4:2=) 2. So she is only two years younger than him. Therefore, now that he is 100 she is (100-2=) 98 years old.

godzilla463· 8 years agoguest· 8 years agoxxjulieisawesomexx· 8 years agodeleted· 8 years agodeleted· 8 years agoxxjulieisawesomexx· 8 years agoguest· 8 years agoguest· 8 years agogandalf_the_grey· 8 years agoguest· 8 years agomeowiamacat· 8 years agomilliedancer12· 8 years agogsharlene· 8 years agodeleted· 8 years agoguest· 8 years agomewlingquim· 8 years agoit's 98

do these people know stuff???

guest· 8 years agoivolunteerastribut· 8 years agoguest· 8 years agoguest· 8 years agojawaswag007· 8 years agogeneralgray· 8 years agocrackerj82· 8 years agoguest· 8 years agojimbles_notronbo· 8 years agoguest· 8 years agotaeminnieah· 8 years agoIf the sister was half his age when he was four, it means she was two, hence she is only two years younger.

100 - 2 = 98.

guest· 8 years agotaeminnieah· 8 years agojimbles_notronbo· 8 years agoguest· 8 years agoguest· 8 years agotaeminnieah· 8 years agoguest· 8 years agokarophon99· 8 years agoguest· 8 years agosugarmochi· 8 years agomeowiamacat· 8 years agosugarmochi· 8 years agodeleted· 8 years agoguest· 8 years agotavros_nitram· 8 years agoguest· 8 years agoneon· 8 years agochakun· 6 years agonichocho· 6 years agojellybabyz22· 5 years agodaaynut· 8 years agoguest· 8 years agomystic_walker· 8 years ago