Question

2+7=12,3+12=18,4+20=28,6+25=?​

Answer 1

Answer:

20

Step-by-step explanation:

  General term :

        Let a term a + b, for this term solution is given by 2b - a( a - 1 ).

For the testing of the formula given above :

     For 2 + 7

         ⇒ 2( 7 ) - 2( 1 )

         ⇒ 14 - 2

         ⇒ 12

   For 3 + 12

        ⇒ 2( 12 ) - 3( 2 )

        ⇒ 24 - 6

        ⇒ 18

   For 4 + 20

       ⇒ 2( 20 ) - 4( 3 )

       ⇒ 40 - 12

       ⇒ 28

In the same manner, following the same pattern :

                 6 + 25

              ⇒ 2( 25 ) - 6( 5 )

              ⇒ 50 - 30

              ⇒ 20

Answer 2

Step-by-step explanation:

Aloha !

$\text{ This is Twilight Astro^_^}$

Using the formula 2b-a(a-1)

1)2(7)-2(2-1)

=14-2(1)

=14-2

=12

2)2(12)-3(3-1)

=24-3(2)

=24-6

=18

3)2(20)-4(4-1)

=40-4(3)

=40-12

=28

4)2(25)-6(6-1)

=50-6(5)

=60-30

=20

Thank you

@ Twilight Astro ✌️☺️♥️