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Algebra Level 2

Given that a + d + c = 5 , b + c + d = 4 a+d+c=5, b+c+d=4 , a = 3 a =3 , either one of d d or c c is one half of a a , and the other is half of a − 1 a-1 . Find a + b + c + d a+b+c+d .


The answer is 7.

Jackson.A.Roberts 2020 by Jackson.A.Roberts 2020 , 20, USA

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1 solution

We know A is 3, D or C is 1.5 and the other .5, so we use the equation with B . We subract the known values. Then we get the value of B . It is 1. Then we add all of them.

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Answer shoul be 7 because by subtrac eq 2 from 1 we ger a- b=1 but a=3 so this gives b=2 also c+d=2 so adding 3+2+2=7

pratham mittal - 5 years, 3 months ago

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Thanks. I have updated the answer to 7.

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Calvin Lin Staff - 5 years, 3 months ago

It is given that a=3 and b+c+d=4 so it should be 7 a+b+c+d=3+4=7

Nikkil V - 5 years, 3 months ago

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