Math question~~please help－dvhtlbz的部落格

標題:

Math question~~please help

發問:

1)Over a soccer season,Annie scored 22 more goals than Branda and Branda scored 19 less than Carrie.Erica scored 2 more goals than Diana and Carrie scored 15 more than Erica.Brenda and Erica scored 6 goals between them.How many goals did the five players score between them over the season and what is the... 顯示更多 1)Over a soccer season,Annie scored 22 more goals than Branda and Branda scored 19 less than Carrie.Erica scored 2 more goals than Diana and Carrie scored 15 more than Erica.Brenda and Erica scored 6 goals between them.How many goals did the five players score between them over the season and what is the total. 2)There are 58 wheels and40 pedals in the window of a bicycle shop.If thee window contains only bicycles and tricycles,find how many of each there are.

最佳解答:

1) Let A = Annie scored B = Branda scored C = Carrie scored D = Diana scored E = Erica scored From the informations above A - 22 = B C - 19 = B E - 2 = D C - 15 = E B + E = 6 Solve: C - 19 = B and C - 15 = E C - 19 + (C - 15) = B + E 2C - 34 = 6 2C = 40 C = 20 C - 19 = B B = 20 - 19 = 1 A - 22 = B A = 1 + 22 = 23 B + E = 6 E = 6 - 1 = 5 E - 2 = D D = 5 - 2 = 3 Therefore, the goals did the five players score between them over the season are A = 23, B = 1, C = 20, D = 3, and E = 5 The total goals of the five players are 23 + 1 + 20 + 3 + 5 = 52 2) Let x be the nos. of bicycles, y be the nos. of tricycles 2x + 3y = 58 --- (1) (2 wheels for bicycle & 3 wheels for tricycle) 2x + 2y = 40 --- (2) (2 pedals for each bicycle & tricycle) (1) - (2) y = 18 subsitute in (2) 2x + 2(18) = 40 x = 2 Therefore, there are 2 nos. of bicycles & 18 nos. of tricycles.

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