Question

m-am gindit la un numar .l-am marit 5 unitati am micsorat rezultatul de 25 ori apoi am triplat noul rezultat si am obtinut 75 la ce numar m-am gind?rog urgent!!!!!

Answer 1

Notam cu x numarul la care m-am gandit

$\bf \: [(x + 5): 25]\cdot \: 3 = 75 ~~~ \bigg|:3$

$\bf \: (x + 5): 25 = 25~~~ \bigg|\cdot25$

$\bf (x + 5) = 625$

$\bf x = 625-5$

$\red{\boxed{\bf x = 620}}$

$\green{\bf \underline{Verificare}}:$

$\bf [(620+5):25]\cdot 3=(625:25)\cdot 3=25\cdot 3=75~(adevarat)$

$==pav38==$