. If a+b=13
b+c=21 and
c+a= 20
then what is the value of a+b+c= ?
.
Answers
Answer:
27
Step-by-step explanation:
a+b=13 <equation1>
b+c=21 <equation2>
c+a=20 <equation3>
adding the three equations 1,2 and 3 we get,
a+b+b+c+c+a=13+21+20
=>2a+2b+2c=54
=>2(a+b+c)=54
=>a+b+c=54/2
=>a+b+c=27
Answer:
What will be the values of a, b and c, if a+b=10, b+c=20 and c+a=24?
Answer
4
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4 Answers

Ragu Rajagopalan, Passionate Maths solver ;Reviving knowledge after 3 decades
Answered April 23, 2018
a+b=10—(1)a+b=10—(1)
b+c=20—(2)b+c=20—(2)
c+a=24—(3)c+a=24—(3)
(1)+(2)+(3)=>2(a+b+c)=10+20+24=54(1)+(2)+(3)=>2(a+b+c)=10+20+24=54
=>a+b+c=27—(4)=>a+b+c=27—(4)
(4)−(1)=>c=27–10=17(4)−(1)=>c=27–10=17
(4)−(2)=>a=27–20=7(4)−(2)=>a=27–20=7
(4)−(3)=>b=27–24=3(4)−(3)=>b=27–24=3
Ans: a=7, b = 3, c = 17