missing numbers....please teach me how to find out?

Mehreen Adnan

New member
89, 80, 71
98, 89, 80
w , 98, 89


What is the value of w.....please tell me the exact way of solving it... :(
176, 232, x
120, 176, 232
64, 120, 176
what is x?

y, 17, 35
17, 35, 53
35, z, 71
what is y n z??

i really cant understand the basis of these questions!! how can we figure out the differences....by adding? subtracting? multiplying?? howw?? if someone cod give me the basic rules or tips..i'll be very vrey thankful
 
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