Instructions

What should come in place of the question mark (?) in the following questions?

Question 128

$$\sqrt[3]{42875}-?=21$$

Solution
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Expression : $$\sqrt[3]{42875}-?=21$$

=> $$\sqrt[3]{35 \times 35 \times 35} - ? = 21$$

=> $$35 - ? = 21$$

=> $$? = 35 - 21 = 14$$

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