exam Maths Puzzle Numerical Ability

Solve the inequality.
2=6x<5x+10

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exam Other Question

How large do you need to make x so that e^(-x/9) that is less than 0.1?

I tried inputting values for x and I came up with 21 as the value for x. Mary changed a one-dollar bill for 14 coins made up of nickels and dimes. How many coins of each kind did she receive?