Question

if 2×3=15
2×5=20
2×7=30
then 2×11=?

Answer 1

it's answer will be 50.

Answer 2

Answer:

65 is the required value of (2 × 11) .

Step-by-step explanation:

Explanation:

Given ,   2 × 3 = 15

2 × 5 = 20

2  × 7= 30  

Here, we can see that the numbers 3, 5, and 7 are consecutive odd numbers and next odd are 9 and then 11 .

By adding 5 to the first result, we obtain the second result, which is 20. In a same manner,  by adding  two times  5  to the second result, we obtained the third result. On adding three times 5 to the third result we get the fourth result  which is 45 .

Step 1:

This pattern can be written as ,

2 × 3 = 15  

2 × 5 = 15 + 5 = 20

2  × 7 = 20 + 10 = 30

2 × 9 = 30 + 15 = 45    [9 is next consecutive odd number ]

2 × 11 = 45 + 20 = 65 .

Final answer:

Hence, 65 is the correct value of (2 × 11 ) .

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