If 36 men can do a piece of work in 25 days, in how many days will 15 men do it?

60 days

Step-by-step explanation:

No. of men = 36, 15
No. of days = 25, x (x = days)
use inverse proportion
36 x 25 = 15x
900 = 15x
900 / 15
x = 60

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)