Question

make a model
blue 7g, yellow 2g, and red 5g
blue 7g
yellow 2g
red 5g
7 + 2 + 5 =
now build a bigger wall.
how many blue bricks? 10
yellow bricks? 5
red bricks? ____?
multiply the number of bricks by the mass.
subtotal mass blue ____
subtotal mass yellow ____
subtotal mass red ____
write your equation to show the total mass of the wall.
draw your wall and color the bricks.

Explanation:

Step1: Sum single brick masses

$7 + 2 + 5 = 14$

Step2: Assume red brick count (use 8, example)

Red bricks: $8$

Step3: Calculate blue subtotal

$10 \times 7 = 70$

Step4: Calculate yellow subtotal

$5 \times 2 = 10$

Step5: Calculate red subtotal

$8 \times 5 = 40$

Step6: Total mass equation

$70 + 10 + 40 = 120$

Answer:

Single brick total mass: $14$
Red bricks (example): $8$
Subtotal mass blue: $70$
Subtotal mass yellow: $10$
Subtotal mass red: $40$
Total mass equation: $70 + 10 + 40 = 120$
(Note: Red brick count can be any positive integer; calculations adjust accordingly. For the drawing, create a wall with 10 blue, 5 yellow, and your chosen number of red bricks, colored to match.)