The person who explained the answer because you can see how they got the answer or the evidence they used to get the answer
Therefore 9600 is the greatest four digit number divisible by given numbers. Then, if we add 600 to 9600 then we can get least five digit number exactly divisible by given numbers. Hence 10209 is the least five digit number when divided by 12,40 and 75 leaves remainder 9.
<> greater than and less than

greater than or equal to and lesser than or equal to
= Is equal to
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This can be also written as y=-2x+2
First of all the - at the beginning = reflection across the x axis.
Then the first 2 is a vertical stretch of 2
the second 2 is a translation of 2 units up.
So
1.ref. across the x axis
2.vert. stretch of 2
3. translation of 2 units up
Brother's weight * 5/8 = 110
Brother's weight * 5/8÷5/8 = 110÷ 5/8
Brother's weight = 176