exam Maths Puzzle Numerical Ability

please help me Im having trouble solving this problem y2=25

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exam Other Question

Given,
log 398.4 = 2.6003
log 39.84 = 1.6003
log 3.984 = 0.6003

make a conjecture concerning the decimal values in the approximations of common logarithms of numbers greater -5x+2y=10