Question

media aritmetica a doua nr nat consecutive este 30,5. determinati nr nat consecutive

Answer 1

$\frac{x+x+1}{2}=30,5$
2x+1=61
2x=60
x=30
x+1=31

Answer 2

(a+b):2=30,5⇒a+b=30,5x2=61
a=b+1
b+1+b=61
2xb+1=61
2xb=61-1=60
b=60:2
b=30
a=30+1=31
proba: (31+30):2=61:2=30,5