Jane downloads album A. A has 11 tracks.
Each track on A costs the same.
The total cost of downloading A is £9.35
Jane also downloads album B and B has 14 tracks.
a) Work out the total cost in pounds (£) of downloading B.
Assume each track costs the same as a track on A.
(3)
+
b) In fact, compared to the cost of each track on A
the cost of 6 tracks on B is less by 7p each
the cost of 8 tracks on B is more by 7p each.
Work out the total cost in pounds (£) of downloading B.
(2)

a) total cost of downloading B is £11.90

b) total cost of downloading B is £12.04

see if that looks right lol

Step-by-step explanation:

a) £9.35 = 935p

935÷11=85p (cost per track)

85 x 14 = 1190p

1190p = £11.90

b) 85 x 6 = 510p

7 x 6 = 42p

510 - 42 = 468p

85 x 8 = 680p

7 x 8 = 56

680 + 56 = 736p

468 + 736 = 1204p

1204p = £12.04

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15