In a box there are many one-euro, two-euro, and five-euro coins. A dispencer draws coins out of the box - one at a time, and stops when three identical coins are taken out. What is the largest possible amount that can be withdrawn?
The answer is 21, please explain why

We want the biggest amount, so here goes:

1. one-euro

2. one-euro

3. two-euro     (he can't pick a one-euro here, otherwise he's done!)

4. two-euro

5. five-euro (he can't pick a two-euro here, otherwise he's done!)

6. five-euro

7. five-euro

1+1+2+2+5+5+5 = 21

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere

3; 9 is 8 to -4

step-by-step explanation: