Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    12
    ReputationRep:
    Can anyone help me solve this question?
    Can someone give me method as well, the answer is 36.4.

    thnxName:  12.png
Views: 115
Size:  41.8 KB
    • Thread Starter
    Offline

    12
    ReputationRep:
    click on picture plz!
    • Thread Starter
    Offline

    12
    ReputationRep:
    plz
    Offline

    6
    ReputationRep:
    So first you need to work out the area of the trapezium which is: the two widths added and divided by 2 multiplied by height. (1.4+3)/2 x 2.4. = 5.28
    Use that area to work out the volume of the whole thing. So 5.28 x 2.5 (height) =13.2m^3.
    Each m^3 = 1000l therefore you have 13200 to fill (as 13.3x1000=13200). However, you only want 85% so you do 13200x0.85=11220- 300= 10,920 (because 85% needs to be filled and 300 litres is already filled).
    Then you do 10920/300 to get how long it will take to fill...
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by marniandrews)
    so first you need to work out the area of the trapezium which is: The two widths added and divided by 2 multiplied by height. (1.4+3)/2 x 2.4. = 5.28
    use that area to work out the volume of the whole thing. So 5.28 x 2.5 (height) =13.2m^3.
    Each m^3 = 1000l therefore you have 13200 to fill (as 13.3x1000=13200). However, you only want 85% so you do 13200x0.85=11220 which is 85% of the whole volume.
    Then you do 11220/300 to get how long it will take to fill...
    ur the best
    Offline

    1
    ReputationRep:
    Edit: Oops, someone submitted an answer as I was still typing mine! It's still below, anyway.

    ================

    Right.

    You need to work out the volume of the tank.

    Volume of tank = cross-sectional area * depth

    Cross-sectional area in cm^2 = 240 * (300 + 140)/2
    = 240 * 220
    = 52,800
    [area of a trapezium]

    Volume in cm^3 = 52,800 * 250
    = 13,200,000

    Volume in litres = 13,200,000 / 1,000
    = 13,200

    Volume to fill in litres = (0.85 * 13,200) - 300
    = 10,920
    [because 85% needs to be filled, and 300 litres already filled]

    Time in minutes = volume to fill / volume filled per minute
    = 10,920 / 300
    = 36.4
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by adam31415926535)
    edit: Oops, someone submitted an answer as i was still typing mine! it's still below, anyway.

    ================

    right.

    You need to work out the volume of the tank.

    Volume of tank = cross-sectional area * depth

    cross-sectional area in cm^2 = 240 * (300 + 140)/2
    = 240 * 220
    = 52,800
    [area of a trapezium]

    volume in cm^3 = 52,800 * 250
    = 13,200,000

    volume in litres = 13,200,000 / 1,000
    = 13,200

    volume to fill in litres = (0.85 * 13,200) - 300
    = 10,920
    [because 85% needs to be filled, and 300 litres already filled]

    time in minutes = volume to fill / volume filled per minute
    = 10,920 / 300
    = 36.4
    ur great!
    • Thread Starter
    Offline

    12
    ReputationRep:
    Name:  12.png
Views: 61
Size:  32.5 KBCAN YOU HELP ME ON THIS AS WELL! SO STUCK! @adam31415926535
    • Thread Starter
    Offline

    12
    ReputationRep:
    (Original post by Adam31415926535)
    Edit: Oops, someone submitted an answer as I was still typing mine! It's still below, anyway.

    ================

    Right.

    You need to work out the volume of the tank.

    Volume of tank = cross-sectional area * depth

    Cross-sectional area in cm^2 = 240 * (300 + 140)/2
    = 240 * 220
    = 52,800
    [area of a trapezium]

    Volume in cm^3 = 52,800 * 250
    = 13,200,000

    Volume in litres = 13,200,000 / 1,000
    = 13,200

    Volume to fill in litres = (0.85 * 13,200) - 300
    = 10,920
    [because 85% needs to be filled, and 300 litres already filled]

    Time in minutes = volume to fill / volume filled per minute
    = 10,920 / 300
    = 36.4
    Can you answer the next question! Plz I beg!!!
    Offline

    14
    ReputationRep:
    (Original post by James2138)
    Can you answer the next question! Plz I beg!!!
    At least give it a try before asking for help
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What's your favourite Christmas sweets?
    Useful resources

    Make your revision easier

    Maths

    Maths Forum posting guidelines

    Not sure where to post? Read the updated guidelines here

    Equations

    How to use LaTex

    Writing equations the easy way

    Student revising

    Study habits of A* students

    Top tips from students who have already aced their exams

    Study Planner

    Create your own Study Planner

    Never miss a deadline again

    Polling station sign

    Thinking about a maths degree?

    Chat with other maths applicants

    Can you help? Study help unanswered threads

    Groups associated with this forum:

    View associated groups
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.