How do you solve #5/b=3/9#?

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Answer 1 · 2016-09-25T04:55:17

#b=15#

start off by writing
#5/b=3/9#

cross multiply
#(3)(b) and (5)(9)#

you now have
#3b=45#

divide each side by #3#
#b=15#

work:
#5/b=3/9#
#3b=45#
#b=15#

TO CHECK, plug in #15# for #b#
#5/15=3/9#

simplify
#1/3=1/3#