F1數學第二部份, 求幫助!!o(_ _)o
Vivian sold an item at a loss of 30% and she lost $45.
a) Find the cost of the item
b) Find the selling price of the item
Daniel sells some jackets with a marked price of $200 each.
7a) Without any discount, it is known that each jacket is sold at a profit of 60%. Find the cost of each jacket.
7b) If Daniel sells the jackets at 40% off, find the percentage profit/loss of selling each jacket.
7c) After offering a discount, the jackets are still sold at a profit of 28%. Find the percentage discount offered.
Mrs. Cheung has bought x barbecue packages A and y barbecue B. There were 6 chicken wings in package A and 4 chicken wings in package B. It is known that Mrs.Cheung bought 34 chicken wings in total. Write an equation in x and y.
There are 6 gears in each large experiment set and 3 gears in each small experiment set. If Gary needs 15 gears, find all possible number of sets in each kind bought.
Steve, Maggie and Cindy buy a birthday gift together, where the amount spent by Steve is 1/3 (三份之一) of that spent by Maggie and 3/4 (四份之三) of that spent by Cindy. Find the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift.
A painter uses 4 hours to paint the 3m × 12m wall of a building. Express his [ainting speed in m2/h **2 is square**
-It is given that the scale of the floor plan of a flat is 1cm to 0.8m.
On the floor plan, the dimensions of the rectangular bedroom are 3cm × 2.5cm. Find its actual area.
Find the area of quadrilateral ABCD
Find the area △ABCD
- 5 年 前最佳解答
a) $200/(100%+60%)= $125
c) 1-125*(1+0.28)/200=0.2 20%off
Let the no. of large experiment set be x and the no. of small experiment set be y.
when x=2, y=1.
when x=1, y=3.
When x=0, y=5.
Let the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift be a, b and c respectively.
Thus, the radio of the amounts spent by Steve, Maggie and Cindy on the birthday gift is 3/16, 9/16 and 1/4 respectively.
Its actual area= (3*0.8)*(2.5*0.8)=4.8msquare
The area of quadrilateral ABCD
=the area oftriangle ABD+the area of triangle ACD
Let(3,-1) be W, (5,3) be X, (-1,-1) be Y and (5,-1) be Z.
the area △ABC
=the area squareWXYZ- the area △WCD-the area △CXB-the area △BZY
- 知足常樂Lv 75 年 前
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