Question 276486
N+2N+N/3=20
(3N+3*2N+N)/3=20
(3N+6N+N)/3=20
10N/3=20
10N=20*3
10N=60
N=60/10
N=6 ANS.
PROOF:
6+2*6+6/3=20
6+12+2=20
20=20