Question

EXERCISE 1.2
1. If2ly5 is a multiple of 9, where y is a digit, what is the value ofy?​

Answer 1

sorry but I am not understanding your question

Answer 2

Answer:

y=1

Explanation:

This can be solved by using the divisibility rule of 9 which states that if the sum of digits of a number is divisible by 9 then the number will also be divisible by 9.

eg, 547335 is divisible by 9

5+4+7+3+3+5=27 which is divisible by 9 so this no will also be divisible by 9

now,

2+1+y+5=divisible by 9

8y=9

so y can be 1

8+1=9

since y is a single digit therefore we have 10 chances to fill (0,1,2,3,4,5,6,7,8,9)

but there is only 1 that when added to 8 gives a no. divisivle by 9.

and next no. divisible by 9 is 18 for which 10 is required to add in 8 which is not possible because it is 2 digit no.