Sarin and his coin bank part 7(Math Question)

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You can read posting Sarin and his coin bank on the story of coin bank.

Read also postings on Sarin and the million numbers to understand concept of dollars and cents.

Lower primary school mathematics question LPQ16

Sarin had a five dollar note, 4 fifty-cent coins and some twenty-cent coins. If he had $9.60 altogether, how many twenty-cent coins did he has?

Solution:

                    2 fifty-cent coins = $1.00

                    4 fifty-cent coins = 2 × $1.00 = $2.00

                    Value of twenty-cent coins Sarin had = $9.60 – $5.00 – $2.00 = $2.60

                    5 twenty-cent coins = $1.00

                    10 twenty-cent coins = $2.00

                     3 twenty-cent coins = $0.60

                     She had 10 + 3 = 13 twenty-cent coins.

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