Question 49
If one third of one-fourth of a number is 15, then three-tenth of that number will be :
Solution
Let the number be X.
Forming the equation:
$$\dfrac{1}{3}\times\dfrac{1}{4}\times X=15$$
$$\dfrac{1}{12}\times X=15$$
$$X=12\times15=180$$
Now, three-tenths of the number: $$\dfrac{3}{10}\times180=54$$
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