EXERCISE 1.2
1. If 21y5 is a multiple of 9, where y is a digit, what is the value of y?
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Number 21y5
Multiple of 9
Value of digit y = 2+1+y+5 = 8+y
Closest multiple of 9 = 18
8+y=18
y=18-8=10
y=10 i.e 1 ten
no: 2115.
2+1+1+5=9
This is the answer.
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Answered by
0
Answer:
8 is the value of y
property is a number is divisible by 9 if sum of all digits is divisible by 9
2+1+y+5=9
where y =8
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