RRB Group-D Model Paper 17 with answers for online practice

The sum of one-third, one-fourth and one-fifth of a number is less than the number by 13.
Let the number be denoted by X. Then, according to question:
⇒ $\frac{\mathit{X}}{3}+\frac{\mathit{X}}{4}+\frac{\mathit{X}}{5}$ =X−13
⇒ $\frac{47}{60}$ X=X−13
⇒ $\frac{13}{60}$ X=13
⇒ X = 60
Hence the number is 60.