jane buys 22 candies for three children,ANNA MARY and PETER .Anna eats twice as Mary candies as Mary Peter eats more candies than mary but less than anna .How many candies Does Peter eats
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Jane buys 22 candies for three children, Anna, Mary and Peter. Anna eats twice as many candies as Mary. Peter eats more candies than Mary but less than Anna. How many candies does Peter eat?
Gọi:
Số kẹo Anna đã ăn là a
Số kẹo Mary đã ăn là b
Số kẹo Peter đã ăn là c
Theo bài ra ta có:
a + b + c = 22 (1)
a = 2 x b (2)
b < c < a (3)
Thay (2) vào (1) ta được:
2 x b + b + c = 22
3 x b = 22 - c
3 x b = 21 + (1 - c) (4)
Vì 21 chia hết cho 3. Suy ra: (1 - c) chia hết cho 3
Vì (1 - c) chia hết cho 3, suy ra: c có thể nhận các giá trị là: 1, 4, 7, 10
Nếu c = 1 thì 3 x b = 21 + (1 - c) = 21. Suy ra: b = 7 (loại vì b > c)
Nếu c = 4 thì 3 x b = 21 + (1 - c) = 18. Suy ra: b = 6 (loại vì b > c)
Nếu c = 7 thì 3 x b = 21 + (1 - c) = 15. Suy ra: b = 5 (nhận)
Nếu c = 10 thì 3 x b = 21 + (1 - c) = 12. Suy ra: b = 4 và a = 2 x b = 2 x 4 = 8 (loại vì a < c)
Vậy: Số kẹo Peter đã ăn là 7 viên
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Peter ăn 7 cái kẹo đó bạn
Nhớ kết bạn với mình nha
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Mary has 12 pens. Peter has 4 times as pen as Mary and Anna has 7 pens more than Peter.
Anna has pens ..... pens.
1. My mother doesn’t enjoy country music, and I don’t like it too. A B C D 2. Mary can make many cakes per hour but Peter can make twice as many than Mar A B C D
Đọc tiếp
1. My mother doesn’t enjoy country music, and I don’t like it too.
A B C D
2. Mary can make many cakes per hour but Peter can make twice as many than Mar
A B C D
Bella has 30 candies. Alice has 5 candies fewer than Bella. Sara has 7 candies more than Bella. How many candies do they have altogether?
Bella has 30 candies. Alice has 5 candies fewer than Bella. Sara has 7 candies more than Bella. How many candies do they have altogether?
Answer: They has candies altogether
Alice has:30-5=25 candies
Sara has:25+7=32 candies
They have:30+32+25=87 candies
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Dịch: Bella có 30 cái kẹo. Alice có ít hơn Bella 5 cái kẹo. Sara có nhiều hơn Bella 7 cái kẹo. Họ có bao nhiêu cái kẹo tất cả.
Answer:
Alice has: 30-5=25(candies)
Sara has: 30+7=37(candies)
They have: 30+25+37=92(candies)
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1. When I (arrive)____________at this house, he was still sleeping.
2. Mary and Anna (wait)___________for Peter since 10 o'clock.
3. Mr. Smith (teach)__________________us French for three years.
4. Before she watched TV, she (do)_____________her homework.
5. By this time yesterday, they (paint)____________more then 15 doors and windows.
1 arrived
2 have been waiting
3 has taught
4 had done
5 will have painted
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arrived
have waited
has taught
had done
were painting
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Bob buy three times as many apples as Peter . Mia buys 7 apples more than Bob and 19 apples more than Peter. How many apples do they buy together ?
Ai biết giải thì hộ nhé
Question 6:
Jack, Mary and Jacob buy ice creams. Jack buys twice as many as Mary. Jacob buys three times as many as Jack. If Jacob buys 12 ice creams then Mary buys ice creams.
Angela buys 26 boxes of candies. There are 36 candies in each box. How many candies does Angela buy?
Angela buy some candies that is 26*36=936[candies] answer:936candies
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