exam Maths Puzzle Numerical Ability

if a:b=1:3 and b:c=3:4 find a:c?

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exam Other Question

Find the slope of the line containing points with coordinates (-6,4) and (5,4) page 43 Chap.7.3
You have $160 and save $7 per week. Your friend has $210 and saves $5 per week. After how many weeks will each of you have saved the same amount of money?