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दो संख्याओं में से बड़ी संख्या का 40% छोटी संख्या के 60% के बराबर है। यदि संख्ययओं का योग 150 है, तो बड़ी संख्या क्या है ?
A. `70`
B. `80`
C. 90
D. 60

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Correct Answer - c
(c ) Let the greater and smaller number is a and b respectively
(माना की बड़ी संख्या तथा छोटी संख्या क्रमशः A तथा B है)
According to the question (प्रश्नानुसार),
Case (i) `qx(40)/(100)=bxx(60)/(100)`
2a = 3b
`a=3/2b" "……(i)`
Case (ii) a + b = 150 ……(ii)
From equation (i) and (ii)
`3/2b+b=150`
5b = 300 `rArr` b = 60
Value of b = 60 put in equation (i)
`a=3/2xx60=90`
Hence greater number = 90

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