A shop that sells nuts has one mixture that is 30% pecans and 70% peanuts. A second mixture is 40% pecans and 60% peanuts. The manager wants to make a mixture that is 38% pecans. She wants to use 25 ounces more of the second mixture than of the first. How many ounces of each mixture should she use

35 % pecans 75% peanuts

=> x = 8.33 oz weight of the first mixture therefore weight of the second mixture would be:

x+25= 8.33+25=33.33 oz

Step-by-step explanation:

We want to find the weight of each mixture which are unknown to us right now, therefore:

Let the weight of the first mixture be x. Then the weight of the second mixture would be (x+25) and the weight of final mixture would be (x + x + 25) = 2x+25.

The first mixture had 30% pecans, therefore the weight of pecans from the first mixture would be 0.3x.

The second mixture had 40% pecans, therefore the weight of pecans from the second mixture would be 0.4 * (x+25).

We will have 38% pecans in the final mixture hence the weight of pecans is 0.38 of the total weight of pecans in the final mixture.

0.38 * (2x + 25)

Therefore

0.38 * (2x + 25) = 0.3x + 0.4*(x + 25).

Now we have one equation one unknown and solve for x:

=> 0.76x + 9.5 = 0.7x + 10

=> 0.76x - 0.7x = 10 - 9.5

=> 0.06x = 0.5

=> x = 50/0.06

=> x = 50/6 = 25/3

=> x = 8.33 oz weight of the first mixture therefore weight of the second mixture would be:

x+25= 8.33+25=33.33 oz

The answer is B.   Because there are 8 ribbons in all. 1 ribbon is black. so the equation would be 1/8. Assuming you don't draw the black ribbon on the first try, then you would try again. The second time you draw a ribbon you don't put the ribbon you drew back in. That means there are only 7 ribbons the second time. The 1 black ribbon is still in the bag than the equation would be 1/7. Then you add the two together. So it would be 1/8 + 1/7 = 1/15. Remember to only add the bottom numbers. not the top ones unless they are different colors or objects.