Problem

$○hcckbhc$ $a1y1s10$
1. 108 2. $616$
EXERCISE $I.2$
1. $ff2ly5$ is a multiple of 9, where y is a digit, what is the value of y?
2. $If31z5is$ a multiple of9, where z is a digit, what is the value of w z?
You will find that there are two answers fIor the last problem $NAy$
3. $If24xisam$ multiple of 3, where x is a digit, what is the value of x?
(Since $24xisam$ multiple $of3,$ its sum of digits $6+xisam$ multiple of
of these numbers: $0,3,6,9,$ $12,15,18$ ... . But since x is a digit, i
$6+x=6or9$ or 12 or $15.$ Therefore, $x=0or3$ or 6 or 9. Thus, =
four different values.)
$c3pz5$ is a $multip|e$ of 3, where z is a digit, what might be the ve

7th-9th grade

Algebra

Solution

Qanda teacher - Ishita

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