Question

(11)
A number multiplied by 3 and increased by 5 is equal to the same number
multiplied by 7 and decreased by 15. What is the number?​

Answer 1

Let the number be x

According to the Question,

x(3)+5=x(7)-15

3x+5=7x-15

3x-7x=-15-5

-4x=-20

4x=20

x=20/4

x=5

Therefore the number is 5.