Question

A number increased by 20 and then reduced by 15 becomes 10. Then the
number is

Answer 1

Answer:

let the number be X

increase  by  20 means x+20

now reduce  15 means     x+20-15= 10

so now solve it becomes

x+5 =10

5 goes to rhs it becomes x=10-5=

x= 5

therefore the number is 5

Answer 2

Answer:

let the no. be X

(X + 20)-15 = 10

or, X+5=10

or,X=5