Afruit stand has 18 red apples this is 40% of the total apples in the stand. how many apples are there in the stand?

18 is 40% of all
all=x
percent means parts out of 100
40%=40/100=4/10=2/5
18 is 2/5 of all
18=2/5 of x

'of' means multiply
18=2/5 times x
18=2x/5
multiply both sides by 5
90=2x
divide both sides y 2
45=x
there were 45 apples in the stand

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When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.