Question

the price of a bowl of plain phở is $6. with 4 ingredients added, the total price is $8. find the price of each ingredient. let n equal the price of each ingredient. which model represents the situation? four bar models are shown, with the first having a bar labeled 8 and four bars labeled n, total labeled 6; the second having a bar labeled 6 and a bar labeled n, total labeled 8; the third having a bar labeled 8 and a bar labeled n, total labeled 6; the fourth having a bar labeled 6 and four bars labeled n, total labeled 8

Explanation:

Step1: Analyze the problem

The plain phở is $6, and with 4 ingredients (each costing LXI0) added, the total is $8. So the equation should be \( 6 + 4n = 8 \).

Step2: Check each model

• First model: Shows 8 + 4n = 6 (incorrect, total should be 8, not 6).
• Second model: Shows 6 + n = 8 (only 1 ingredient, but we have 4, so incorrect).
• Third model: Shows 8 + n = 6 (incorrect, total is 8, and plain is 6).
• Fourth model: Shows 6 (plain) + 4n (4 ingredients) = 8 (total), which matches the equation \( 6 + 4n = 8 \).

Answer:

The bottom - most model (the one with 6, four \( n \)s, and total 8)