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Question
In the given multiplication a and b are natural numbers Then (a + b) is
A
5
B
6
C
8
D
9
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Solution
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Correct option is D)
$(30+a)×2=70$
$60+2a=70$
$2a=10$
$a=5$
$(30+a)×b=140$
$(30+5)×b=140$
$35×b=140$
$b=4$
So, a+b=5+4=9
Answer (D) 9
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