Question

the sum of two facing pages of an opened book is divisible by 3 , the sum is 21, what r the two facing pages????? ,​

Answer 1

Answer:

10 and 11

Step-by-step explanation:

x + x + 1 = 21

2x = 20

x = 10

Answer 2

Step-by-step explanation:

Given:-

the sum of two facing pages of an opened book is divisible by 3 , the sum is 21

To find:-

what are the two facing pages?

Solution:-

Let the facing pages of an opened book be X and X+1

Given that

The sum of two facing pages of an opened book =21

=> X+X+1 = 21

=> 2X+1 = 21

=> 2XX = 21-1

=> 2X = 20

=>X = 20/2

=> X =10

X+1 = 10+1 = 11

Answer:-

The two facing pages of an opened book are 10 and 11

Check:-

Pages are 10 and 11

Their sum = 10+11=21 is divisible by 3