book Maths Puzzle Numerical Ability

Jamil always throws loose change into a pencil holder on his desk and takes it out every
two weeks. This time it is all nickels and dimes. There are 9 times as many dimes as
nic

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book Other Question

Hi! I need help with two problems. (^ means exponent follows)

2e^2x = 5^x+1

and...

log(x+1)-log(x)=2

thanks!
find three consecutive odd integers whose sum is 105