यदि ( x+5) : 45::1:5 हो तो x ज्ञात कीजिए
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(x+5) : 45::1:5
(x+5)/45 = 1/5
(x+5)×5 = 1×45
5x + 25 = 45
5x= 45- 25
5x = 20
x= 4
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