Instructions
What should come in place of the question mark (?) in the following questions?
Solution
Expression : $$? \% of (4)^? = 51.2$$
=> $$\frac{x}{100} \times (4)^x = 51.2$$
=> $$x \times (4)^x = 5120$$
=> $$x \times (4)^x = 5 \times 1024$$
=> $$x \times (4)^x = 5 \times 4 \times 4 \times 4 \times 4 \times 4$$
=> $$x \times (4)^x = 5 \times 4^5$$
Comparing both sides, we get :
=> $$x = 5$$
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