Mathcounts
Quoc Tran Anh Le Coodinator
27/02/2019 at 11:13Huỳnh Anh Phương
11/02/2019 at 08:34
Nguyễn Mạnh Hùng 16/02/2019 at 13:23
A notebook costs: 16.80 : 8 = 2.10 ($)
A pen costs: 15.25 : 5 = 3.05 ($)
Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($)
Anna received: 2 x 20  32.80 = 7.20 ($)
Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)
Benny received: 2 x 20  41 = 1 ($)
=> Anna received more and more than: 7.20 + 1 = 8.20 ($)

Conandtb 21/02/2019 at 14:21
A notebook costs: 16.80 : 8 = 2.10 ($)
A pen costs: 15.25 : 5 = 3.05 ($)
Anna buys: 2.10 x 4 + 3.05 x 8 = 8.40 + 24.40 = 32.80 ($)
Anna received: 2 x 20  32.80 = 7.20 ($)
Benny buys: 5 x 2.10 + 10 x 3.05 = 10.50 + 30.50 = 41 ($)
Benny received: 2 x 20  41 = 1 ($)
=> Anna received more and more than: 7.20 + 1 = 8.20 ($)
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