SOLUTION: Two-fifths of a certain no. decreased by three-fourths is equal to seven-eights. What is the no.?
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Question 12055: Two-fifths of a certain no. decreased by three-fourths is equal to seven-eights. What is the no.?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Let n be the number you are looking for.
From the description, you can write:
Let's clear the fractions by multiplying through by the common denominator of 40.
Add 30 to both sides.
Divide both sides by 16.
= 4 1/16
The number is: 4 1/16 That's 4 and 1/16
Check:
= 7/8
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