If
2 X 5 = 20
3 X 6 = 54
4 X 5 = 80
5 X 6 = 150
then
9 X 10 = ?

• 2^2 * 5 = 20
  3^2 * 6 = 54
  4^2 * 5 = 80
  5^2 * 6 = 150
  9^2 * 10 = 810
  
  Ans : 810
  
• 10 years agoHelpfull: Yes(6) No(0)
• series is like 2x5=20 -->2x(2x5)=20
  3x(3x6)=54-->
  9x10 will be 9x(9x10)=810
• 7 years agoHelpfull: Yes(1) No(0)
• 2*5=10*2=20;; 3*6=18*3=54;;4*5=20*4=80;;5*6=30*5=150;;9*10=90*9=810
• 10 years agoHelpfull: Yes(0) No(0)
• 20 = 2×5×2
  54 = 3×6 × 3
  80 = 4×5 ×4
  150 = 5 ×6 × 5
  180 = 6 × 5 ×6
  294 = 7 × 6 × 7
  320 = 8 × 5 × 8
  486 = 9 × 6 × 9
• 10 years agoHelpfull: Yes(0) No(0)
• Here n X m=(n X m) X n is used.
  That is
  2 X 5= (2 X 5) X 2=20
  
  Similarly, 9 X 10=(9 X 10) X 9=810
  
  Ans-810
• 10 years agoHelpfull: Yes(0) No(0)
• n X m=(n X m) X n
  Is a logic used according to the given equations.
• 10 years agoHelpfull: Yes(0) No(0)
• 2*5=10*2=20
  3*6=18*3=54
  4*5=20*4=80
  5*6=30*5=150
  9*10=90*6=540
  answer is 540
• 10 years agoHelpfull: Yes(0) No(0)
• 810
  9*10*9=810
• 10 years agoHelpfull: Yes(0) No(0)
• 9*9*10=810
• 10 years agoHelpfull: Yes(0) No(0)
• ans is 810
  9*(9*10)=810
  
• 10 years agoHelpfull: Yes(0) No(0)
• the solution format is this a * b = c
  c *a = the ans..
  like that 2*5 = 10 , then 10 *2 =20
  like that 9*10=90, then 90 *9=180.
  this is ans..180
• 9 years agoHelpfull: Yes(0) No(1)
• 9*10=9*10*9=810
• 9 years agoHelpfull: Yes(0) No(0)
• 2*2*5;
  3*3*6;
  4*4*5;
  This way---9*9*10=810
• 8 years agoHelpfull: Yes(0) No(0)
• given that 2*5=20 it can be done as (2*5)*2=20,similarly (3*6)*3=54,......(5*6)*5=150.
  so the answer is (9*10)*9=810
• 7 years agoHelpfull: Yes(0) No(0)
• 810
  2*2=4*5=20
  3*3=9*6=54
  4*4=16*5=80
  55=25*6=150
  9*9=81*10=810
• 7 years agoHelpfull: Yes(0) No(0)
• 2 x 5 =10 x 2 = 20
  3 x 6 =18 x 3 = 54
  4 x 5 = 20 x 4 =80
  5 x 6 = 30 x 5 =150
  6 x 7 = 42 x 6 = 252
  7 x 8 = 56 x 7 = 392
  8 x 9 = 72 x 8 = 576
  9 x 10 =90 x 9 =810
  
  answer = 810
• 7 years agoHelpfull: Yes(0) No(0)