Question

Plz solve 21
And if you can then others

Answer 1

x+x+4+x+8+x+12+x+16/5=13
5x+40/5=13
5x+40=13*5
5x=65-40
x=25/5=5
therefore the observations are
x=5
x+4=5+4=9
x+8=5+8=13
x+12=5+12=17
x+16=5+16=21




hope this helps
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