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December 1st, 2018, 04:21 AM   #1
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Joined: Dec 2018
From: Italy

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Talking Greetings

Hello everybody!

My name is Lorenzo and I am an Italian student of civil engineering. I love both math and English, so I thought that this forum will be the best!

Have a nice afternoon!
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December 1st, 2018, 11:53 AM   #2
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welcome!
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December 6th, 2018, 04:20 AM   #3
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From: UK

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Hi Everyone,

Glad to be here.

Can any one help with the below.

Can you help to derive a formula that can calculate b2, b3, b4 where
T = a1(b1) + a2(b2) + a3(b3) + a4(b4)
a1=a2=a3=a4=0.25
b1+b2+b3+b4=1
b1<b2<b3<b4
b1 = x1
T = y

For example, one solution is b1=16%, b2=26%, b3=46% for
Y = 2 and x1=12%
2 = 0.25(12%) + 0.25(16%) + 0.25(26%) + 0.25(46%)

How to calculate b2, b3, b4 be when
Y = 2 and x1 =14%
2 = 0.25(14%) + 0.25(?) + 0.25(?) + 0.25(?)
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