exam Maths Puzzle Numerical Ability

Find the digit wherein twice of it was exceed by 6 and its sum is three less 5 times the digit.

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exam Other Question

Burundi has a population of 7548000 in 2008, it has a growth rate of 3.9%, what is the approximate population in 2012? I cannnot find a formula to work this. Is there one specific for growth? thanks in advance for your help!!! 12 RADICAL 48 + 4 RADICAL 27 + 6 RADICAL 75 + RADICAL 3 = X RADICAL 3
SOLVE FOR X
SORRY COULDNT FIGURE OUT HOW TO GET THE RADICAL SYMBOL,
IM COMPUTER STUPID....THANKS