Box1 contains 500 marbles, 24% of which are black. box2 contains some marbles of which 10% are black. you put the marbles together in another box and found that the percentage of black marble is 20%. how many medals were there in box 2? a. 100 b.150 c. 200 d. 250 e. none of these

There are 200 marbles were there in box2.

Given that,

Box1 contains 500 marbles, 24% of which are black.

Box2 contains some marbles of which 10% are black.

You put the marbles together in another box and found that the percentage of black marble is 20%.

We have to determine,

How many marbles were there in box 2?

According to the question,

Let, denote the number of black marbles in box1,

and denote the number of black marbles in box2, respectively.

Then,

The total number of marbles in box1 is,

And, The total number of marbles in box2 is,

The marbles together in another box and found that the percentage of black marble is 20%.

Substitute the value of in the given equation,

Hence, there are 200 marbles were there in box2.

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Let and denote the number of black marbles in box 1 and 2, respectively, and and the total number of marbles in box 1 and 2, respectively. Then

Since , we have

so there were 200 marbles in total in box 2 at the start.

hi! i think the answer is 1/2 : )