Answer:
21
Step-by-step explanation:
Now solving to find the sara´s number.
Lets assume the Sara´s number be "x".
∴ as given 15 is subtracted from the number.
= [tex](x-15)[/tex]
Next, as given negative 3 is multiplied to the difference.
= [tex]-3(x-15)[/tex]
As given, the final result will be equal to negative 18.
⇒ [tex]-3(x-15)= -18[/tex]
Using distributive property of multiplication to distribute -3 with x and -15
⇒[tex]-3x+45= -18[/tex]
Adding 18+3x on both side.
⇒ [tex]3x= 63[/tex]
Cross multiplying both side.
∴ x= [tex]\frac{63}{3} = 21[/tex]
Hence, Sara´s number is 21.
