Jayden's answer to crxrries's Primary 6 Maths Singapore question.
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Total of 4 number = 644
Average = 161
The next average is multiple of 5 = 165
165×5 = 825
825-644= 181(not a 2 digit even number)
So, the average should be less than 161 since the new number is 2 digit even number.
So average either
160
155
150
145
140...
644+56=700
Average = 140 (multiple of 5)