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Call the number you are looking for N
So we konw 15% of is 60 so we write

.15N=60
Now to find N divide both sides by .15

N=60/.15=400

So check it without a calculator, note that 10% of 400 is 40 and half of that is 20 so that is 5% of 400. Now 40+20=60 as desired

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15y ago

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