tinatis
19.07.2019 •
Mathematics
Mrs. li bought some crackers. she gave 30% of the crackers to her neighbor and ate 50% of the remaining crackers. mrs. li had 42 crackers left. how many crackers did mrs. li buy?
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Ответ:
She bought 120 crackers
Explanation:
Assume that the number of crackers she originally bought was x
We know that she gave her neighbor 30% of the crackers.\This means that:
amount left with her = x - 30%x
amount left with her = x - 0.3 x
amount left with her = 0.7x crackers
Now, we know that she ate 50% of that amount.
This means that:
she ate 50%(0.7x) = 0.5(0.7x) = 0.35x crackers
amount left with her = 0.7x - 0.35x = 0.35x crackers
Finally, we know that the number of crackers left with her is 42 crackers.
This means that:
0.35x = 42
x =
x = 120 crackers
Hope this helps :)
Ответ: