exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Graph the following:
y = -x - 2
Solve (1/81)^t = 243^t-2.

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