15 a) Simplify the ratio 18 : 24
[2]
b) Divide $90 in the ratio 2 : 3
[3]
16. a) Express 0.45 as a percentage.
[2]
b) Find 20% of $350.
[3]
c) A jacket costs $120. A shop gives a 15% discount.
i) Calculate the discount.
ii) Find the final price paid.
[3]
[2]
17. Evaluate:
a) 8+6×3 [1]
b) 12−4×(6−2)
[1]
c)5+32×4
[1]
18 a) Convert 1011₂ to base 10.
[3]
b) Convert 13₁₀ to base 2.
[3]
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