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The three-tenth of an unknown number can be figure out as:
Let suppose the number is y.
Now, one-fourth of this number
y x 1/4
One-third of one-fourth of that number is 15
1/3(y x 1/4) = 15 ________ (i)
Value of y can be figure out easily from equation (i) by just simplifying it (y = 180).
Now, number is known to us (y = 180). Three-tenth of that number (180 x 3/10) will be 54 which is our required answer.
Number = ?
Number = y
According to the given condition
1/3(y x 1/4) = 15
y x 1/4 = 15 x 3
y x 1/4 = 45
y = 45 x 4
y = 180
According to the second condition
180 x 3/10 = 18 x 3 = 54
Required Number = 54 answer
If one-third of one-fourth of that number is 15, then three tenth of that number is 54.