Question

Afla numarul necunoscut din relatia:6plus(37-a-9plus1):2egal20

Answer 1

6 + ( 37 - a - 9 + 1 ) : 2 = 20

( 37 - a - 9 + 1 ) : 2 = 20 - 6

( 37 - a - 9 + 1 ) : 2 = 14

37 - a - 9 + 1 = 14 × 2

37 - a - 9 + 1 = 28

37 - a = 28 - 1 + 9

37 - a = 27 + 9

37 - a = 36

a = 37 - 36

a = 1