If 2=6 3=12 4=20 5=30 6=42 9=?

Brian teaser thats teasing me

38 Answers

  • 2 * 3 = 6

    3 * 4 = 12

    4 * 5 = 20

    ….

    9 * 10 = 90

  • 2×2=4+2=6

    3×3 =9 +3 =12

    4 x 4 = 16+4 =20

    5 x 5 =25 +5=3

    6 x 6 =36 +6 =42

    7 x 7 49+7 =54

    8x 8 =64+8=72

    9 x 9 =81+9=90

  • 20 5 30 6 42 7

  • could be 90 for the reasons given. Could also be 56 if you look at just the answers

    6 – 12 – 20 – 30 – 42

    12-6=6

    20-12=8 or 6+2

    30-20= 10 or 8+2

    42-30= 12 or 10+2 so the next step would be

    12+2= 14+ (our last increase) 42= 56

  • The Answer is 90, but………what if saying 2=6, 3=12, 4=20, 5=30, 6=42 meant saying for one of the first digit (2, 3,4,5,6.7.8 and 9) = all the second digit in order are (6 to 12 = 6, 12 to 20 =8, 20 to 30 =10, 30 to 42 =12) which mean every secondary number is separated by the amount of the next number (6, 8, 10, 12) which means the next number is 56 (42 to 56 =14).

  • 2=6

    3=6+6=12

    4=12+8=20

    5=20+10=30

    6=30+12=42

    7=42+14=56

    8=56+16=72

    9=72+18=90

  • 2=6 3=12 4=20 5=30 6=42 9=?

    2=6 → 2 =2×3 →

    3= 12→ 3=3×4

    4= 20 → 4=4×5

    6 = 42 →6=6×7

    Hence

    9=9×10=90

  • 9= 90

    2 x 3= 6

    3 x 4= 12

    4 x 5= 20

    5 x 6= 30

    6 x 7= 42

    7 x 8= 56

    8 x 9= 72

    Hope I helped 🙂

  • Notice that the right hand number is always the left hand number times the left hand number plus 1.

    I.e. each right hand side has the form n*(n+1). Lets check

    2*(2+1) = 2*3 = 6

    3*(3+1) = 3*4 = 12

    4*(4+1) = 4*5 = 20

    5*(5+1) = 5*6 = 30

    … and so on.

    Thus in the case where n=9

    9*(9+1) = 9*10 = 90

    So your answer is 9 = 90

  • A resposta é 60.

    Dobro de 3=6, 6+6=12

    Dobro de 4=8, 12+8=20

    Dobro de 5=10, 20+10=30

    Dobro de 6=12, 30+12=42

    Dobro de 9=18, 42+18=60

  • 2=6

    3×2+6=12

    4×2+12=20

    5×2+20=30

    6×2+30=42

    9×2+42=60

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