exam Maths Puzzle Numerical Ability

Write 3 equations equivalent to 6x=10 and one that is non equivalent.
we came up with x=1.6-

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exam Other Question

Solve these simultaneous equations:

2log(2)y = log(4)3 + log(2)x

3^y = 9^x

given that x and y are positive

I have no idea how to even begin to solve this Bacteria has a tripling time of 8 minutes. If there were initially 24 spores of bacteria on a hamburger, how many spores will be present after one hour ?