How many marbles of each colour

-

Sophie has a box of red, blue, and green marbles. She knows that:

  • There are 3 times as many red marbles as green marbles.
  • There are 12 more blue marbles than green marbles.
  • Altogether, she has 72 marbles.

How many marbles of each colour does Sophie have?

Comments

  1. Rithvik22 March 2025 at 09:45

    Let the number of green marbles = x

    Then:

    Red marbles = 3x

    Blue marbles = x + 12

    Now total them:

    x (green) + 3x (red) + x + 12 (blue) = 72

    Combine like terms:

    5x + 12 = 72

    Subtract 12 from both sides:

    5x = 60

    Divide by 5:

    x = 12

    Now plug it back in:

    Green marbles = 12

    Red marbles = 3 × 12 = 36

    Blue marbles = 12 + 12 = 24

    Final Answer:

    Green marbles: 12

    Red marbles: 36

    Blue marbles: 24

    ReplyDelete

Post a Comment

Popular posts from this blog

Word Problem

-
A bridge is built across a river. One quarter of the bridge is over the left bank of the river and one third of the bridge is over the right bank. The river is 120 m wide. How long is the bridge?
Read More »

A box of biscuits

-
A box of biscuits contains 36 biscuits. 20 biscuits have foil wrappers. 15 are chocolate biscuits with foil wrappers. If 9 are not chocolate and do not have a foil wrapper, then how many chocolate biscuits are there?
Read More »