exam Maths Puzzle Numerical Ability

The fuel for a two-cycle motorboat engine is a mixture of gasoline and oil in the ratio of15 to 1. How many liters of each are in 6.6 L mixture ?

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exam Other Question

A rectangle is 5 times as long as it is wide. If the area is 125 square feet, find its perimeter. Plot the graphs of the following functions.
1. f(x) = 7^x
2. f(x) = 4^x-3
3. f(x) = (1/5)^x
4. f(x)= log(base3)x