MATHEMATICS MIDDLE SCHOOL

Liang went to the bookstore. he spent 1/3 of his ,money on a pen and 4/7 of it on books. what fraction of his money did he have left?

Answers

Answer 1
Answer: Convert into like fractions --> 
1/3 = 7/21 4/7 = 12/21
7+12 = 19
19/21 is spent therefore he has 2/21 left
Answer 2
Answer:

The fraction of the amount Liang has left is (2)/(21)

  • Let X = Amount spent on a pen; X = (1)/(3)
  • Let Y = Amount spent on books; Y = (4)/(7)
  • Let M = Amount of money Liang has got; M =?
  • Let L = Amount of money Liang will have left; L = ?

Further Explanation

To derive L (amount of money Liang will have left), add X (amount spent on a pen) and Y (amount spent on books) together, then the derived value be subtracted from M (fraction of total amount Liang has got) i.e.: M – (X + Y)

Therefore, L = M – (X + Y)

Deriving (X + Y)

= X + Y

= (1)/(3) + (4)/(7)

= (1 x 7) + (3 x 4) / 21

= (7) + (12) / 21

= 7 + 12 / 21

= (19)/(21)

X + Y = (19)/(21)

Since the lowest common denominator of the fraction of X and Y = 21, then the fraction of M = (21)/(21)

Thus, M = (21)/(21)

Recall, L = M – (X + Y)

Thus,

L = (21)/(21) – (19)/(21)

L = (1 x 21) – (1 x 19) / 21

L = (21) – (19) /21

L = 21 – 19 /21

L = (2)/(21)

Hence, the amount Liang will have left is (2)/(21)

LEARN MORE:

KEYWORDS:

  • denominator
  • numerator
  • numbers
  • fraction
  • liang

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Answers

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Answers

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Martine puts numbers in the order shown 518,673, ,729. which number can Martine put on the empty card...659, 821, 722, or 854

Answers

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Leena knits 10 rows in 12 min. At this pace, how long will it take her to knit the next 25 rows?How many minutes did it take?

Answers

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So, Your Final Answer would be 30 minutes

Hope this helps!

Answer:

30 Minutes

Step-by-step explanation:

I took the test online in K12 and when I reviewed it said that 30 is the correct answer.

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Answers

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Answers

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