यदि किसी संख्या का 40% का 60% 10.5 है तो संख्या बताये
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let the no. be x
x×40/100=y×60/100=10.5
2x/5=3y/5=10.5
3y=10.5×5
y=2.1/3
y=0.7
then the no. be x=10.5×5/2
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