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If you notice that $1.8=18/10$
then this can be done (or almost done) in your head:

$18/10*25+32$

$color(white)("XXX")=18/2*5+32$

$color(white)("XXX")=9*5+32$

$color(white)("XXX")=45+32$

$color(white)("XXX")=77$

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