Question

a number is multiplied by 15 and then added to 50 gives 155.find the number.

Answer 1

let no. is x
ATQ
15x+50=155
15x=105
x=7

OK

Answer 2

Heya !!

$\text{Let that number be x}\\\\\text{Now, According To The Question,}\\\\15x + 50 = 155 \\\\\implies 15x = 155-50\\\\\implies 15x = 105\\\\\implies x = \dfrac{105}{15}\\\\\therefore \boxed{x = 7} .....$

Hope it helps !!