A sum of money at simple interest amounts to 815 in 3 years and to 854 in 4 years. The sum is:

Step-by-step explanation:

So the amount after 4 yrs = amount after 3 yrs plus interest for 1 year;

one year =854-815=39 rate of simple interest;

so 3 yrs x 39 simple interest = 117;

so 815-117 = 698

the sum is 698

answer by yourhope:

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a farmer that lived in ancient egypt would most likely be barried in the sand, in the desert!

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answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0