My daughter brought this home last night and told her mom it is just "part of a primary school 4th grade math quiz". Can you help me on this, mummy?
Piece of cake, honey. My wife smiled.
And after a rough night, she sent it to me.
Get it done and show our girl what her parents are capable of. She ordered.
Piece of cake, honey. I smiled.
And that was 4 hours ago. Now I'm still struglling, going nowhere, and I'm look kind of like this:
Mighty Steemit, help me out!
(BTW, this is a primary school question, no fancy stuff like trigonometric etc. here)
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我女儿昨晚把这玩意儿带回家，说是道小学四年级的数学测验题。“能教教我怎么做么，妈妈？”
老婆微笑着回答：“没问题，宝贝。分分钟搞定。”
然后她就差不多熬了个通宵。
今天早上，蓬头垢面的老婆命令我：
解决它！不能让孩子知道她的爸妈这么没用！
我微笑着回答：“没问题，宝贝。分分钟搞定。”
那已经是四个小时以前的事了。现在我正满头包，看上去是这样的：
万能的Steemit，帮帮忙吧！
（对了，这是小学数学，表整三角函数之类的东东）
a + b = 160
a + c = 150
b + d = 140
d + c = 130
a+b+0c+0d=160
a+0b+c+0d=150
0a+b+0c+1d=140
0a+0b+c+d=130
1 1 0 0 160
0 -1 1 0 -10
0 0 1 1 130
0 0 1 1 130
rank<4
it seems an infinite solution set
I stopped there too. Multivariate equation is a dead end. Need to go back to fundamental geometic rules
Best solution I saw. Beautiful
C = 10
Em~~ its close, but try again:)
does the top triangle is a right-angle triangle ? @mr-j
I dont think so
@mr-j
it is C=40
Sorry buddy, need to try again
@mr-j
Last answer, it is C=30
I just posted a solution, and it is beautiful:)