Given that 4a = 5b = 20, what is the value of 24ab?

Correct answer marked below

A

1,600

480

Correct

C

240

D

80

E

40

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Since 4a = 20, we can find that a = 5. Similarly, from 5b = 20, we find that b = 4.…

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What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.

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