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The fifth triangle number, known as T5 is 15.
The answer is 15. One fifth of 12,000 is 600. One quarter of 600 is 150. One tenth of 150 is 15 !
Finding one fifth of a number is the same as multiplying the number by 1/5, or 0.2. In this instance, 45 x 0.2 = 9.
To add one fifteenth (1/15) and one fifth (1/5), first convert one fifth to have a common denominator of 15. One fifth is equivalent to three fifteenths (3/15). Therefore, 1/15 + 3/15 equals 4/15.
Starting with 1, it is 15.