SATs questions (algebra answers)

Question 1

a) No. of days = 5 days

    Total cost = 12 + (2.50 x 5) = 12 + 12.50 = £24.50

b) £3

c) Total cost = 3 + (2.50 x 5) = 3 + 12.50 = £15.50

d) £9

Question 2

a) Total cost = £215 installation fee + £499 per solar panel

b) Cost per panel = 499 x 3 = 1497

    Total cost = 215 + 1497 = £1712

c) 8+4+5+7+8 = 32

Question 3

a) Depth = 2 x (4 + 5) = 2 x 9 = 18mm

b) Hours = (depth/2) – 5 =

(16/2)-5 = 8-5 = 3 hours

c) -4+13 = 9°C

Question 4

a) 

b) Number of houses  = 12 x ( 15 + 75 )  = 12 x 90 = 1080 houses

Question 5

a) New beads = ( 12 x 3) ÷ 4 = 36 ÷ 4 = 9

b) Recycled beads = (24 x 4) ÷ 3 = 96 ÷ 3 = 32

c) Left to right = England, Scotland, Wales, Northern Ireland

Question 6

a) Number of oak trees = (16 x 5) ÷ 4 = 80 ÷ 4 = 20

b) Total = 20 +16 = 36 trees

c) Temp = 20% x 30 = 24°C