How do you solve #61+ p = 70#?

1 Answer
Alan P.
Oct 28, 2016

#p=9#

Explanation:

Given #61+p=70#

By observation

Ask yourself how much do I need to add to #61# to get #70#?

Mechanically
Subtract #61# from both sides:
#color(white)("XXX")61+p-61=70-61#

#color(white)("XXX")p+(61-61)=9#

#color(white)("XXX")p=9#

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