Question

Determinati nr natural n stiind ca uramatoarele propozitii sunt adev. n/10=1/5 ,2/7=n/21 , 3/2=n/8 ,n/20=1/4 , 21/3=7/n

Answer 1

n/10=1/5
n=5*10=50

2/7=n/21
n=2*21/7=6

3/2=n/8
n=3*8/2=12

n/20=1/4
n=20/4=5

21/3=7/n
n=3*7/21=1