If 20% of the number is 35, what is 50% of that number?

87.5.

Step-by-step explanation:

Let's call that number x. We have that 20% of x is 35, that is x*0.2 =35. Now, 50% = 0.5. Then

.

Then, 50% of that number x is 87.5.

the answer is:

the correct option:

b.

to solve the problem, we need to remember how to operate to simplify exponential expressions using the logarithms.

we are given the equation:

then, using placing logarith with base 7 on both sides of the equation, we have:

so, rounding the obtained result to two decimal places (nearest hundreth), we have:

hence, we have that the correct option:

b.

have a nice day!