Feb 2018 Flashcards
Past paper
The average is the same as the mean.
Add all the sales per day and divide by the number of days.
225+188+208+241+222+320 = 1404
1404÷ 6 = 234
Check: Reverse calculation
234 x6 = 1404
The range(R) is the difference between the highest and lowest number.
325 - 175 = 150
Substitute the values into the formula
V =100R/M
R = 150 and M is the mean = 250
V = 100x150/250 = 60
He is incorrect V is 60%
Read the information carefully
160 cups of tea are sold
The ratio of coffee to tea is 3 : 2
Divide 160 by 2 to find one part
160÷2 = 80
So the number of cups of coffee sold is 3 x 80 = 240
Work out sales from coffee 240 x £2.2 = £528
Work out the sales from tea 160 x 1.80 = £288
Total sales = 528 + 288 = £816
Profit = 1/3 of total sales
816 ÷ 3 = £272
find the area of the front 3x2.5 = 7.5
This will be the same as the back so multiply by 2 = 15m2
Find the area of the side = 7.4 x 2.5 = 18.5m2
The roof and floor are not included so there will be 2 sides with this surface area. 2x18.5 = 37m2
Total area = 37 + 15 = 52m2
3/4 of this area will need bricks
Divide by 4 to find 1/4 and then multiply by 3 to find 3/4
52÷4 = 13 x 3= 30m2
1m2 needs 60 bricks so 30 m2 will need 30 x 60 = 2340 bricks
There are 360 bricks in each pack so he will need 2340÷360 = 6.5
Yes 7 packs will be enough
Ratio question
The ratio of cement, sand and lime to make 1.7 tonnes of dry mortar is
1 : 5 : 2
Add all parts of the ratio together to find the total number of parts
1+5+2 = 8
Divide 1.7 tonnes by 8 to find the value of 1 part
1.7 ÷ 8 =0.2125 record all the decimal places until the end
Lime is 2 parts of the ratio so the mass of lime is 2 x 0.2125 =0.425
Round to two dp (decimal places) = 0.43
The volume of a cuboid is l x b x w (Check no units need converting)
3 x 0.1 x 0.2 = 0.06 m3
1 m3 = 2500Kg
so 0.06 m3 = 0.06 x 2500 = 150Kg
Yes Joe is correct.
