Question

madam/ sir
plss help me really nessesary
help mee

6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it
take if only 5 pipes of the same type are used ?
iWhat is the number whose cube is 216 ?
Add 7x2 - 4x +5,-3x2+2x-1 and 5x2-x+9​

Answer 1

Answer:

I. approx 67 minutes or 1hour 7minutes

ii. 6

iii. 9x2-3x+13

Step-by-step explanation:

1. In 80 minutes tank is filled by - 6 pipes

So, a pipe would fill it in- 80/6 = 40/3

Now, 5 pipes would fill in- 40/3 × 5 = 200/3 = 66.67minutes = approx 67 minutes

2. 216 = 2×2×2×3×3×3

= (2x3)3

= 63

So, 216 is the cube of 6

3. 7x2 - 4x + 5

- 3x2 + 2x -1

5x2 - x +9

___________

9x2 -3x +13

___________

Answer 2

Step-by-step explanation:

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