?
If X and Y are the two digits of the number 347XY such that the number is completely divisible by 80, then what is the value of X + Y?
Answer & Solution
Correct Answer:
Option
A
Given: 347XY where X, Y two digit number is completely divisible by 80.
$$\eqalign{ & \frac{{347XY}}{{80}} = \frac{{347XY}}{{8 \times 10}} \cr & \frac{{7 + X + Y}}{8} \cr} $$
∴ Y must be zero
So, go through option A
Put X = 2, then number 3472 is divisible by 8.
$$\eqalign{ & \frac{{347XY}}{{80}} = \frac{{347XY}}{{8 \times 10}} \cr & \frac{{7 + X + Y}}{8} \cr} $$
∴ Y must be zero
So, go through option A
Put X = 2, then number 3472 is divisible by 8.
Join the Discussion
Login to post a comment or share your explanation.
Login