Since 20 - 15 =5 the answer is 15
Alternate method. What he ate plus what is left over must equal 20. We know that 15 + 5 =20, so again the answer is 15
Since 20 - 15 =5 the answer is 15
Alternate method. What he ate plus what is left over must equal 20. We know that 15 + 5 =20, so again the answer is 15
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