Question

a+a=27

Answer 1

a + a = 27

a = 27 : 2 

a =  13,5

13,5 + 13,5 = 27

Answer 2

vd;  20  + 7 

    17  + 10.........................

Answer 3

a = 13,5

Answer 4

a+a=27

2a=27

a=27:2

a=13.5

vay a=13.5

Answer 5

a=13,5

Answer 6

= 10 + 20 = 27

Answer 7

a+a=27

<=> 2a=27

a=27:2

a=13,5

Vậy a=13,5