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Chapter 7: Q.468. (page 741)

If the cost of a pizza varies directly with its diameter, and if an8''diameter pizza costs$12, how much would a6''diameter pizza cost?

Short Answer

Expert verified

The cost of pizza will be$9.

Step by step solution

01

Step 1. Given information.

The costcvaries directly with a diameterd, whenrole="math" localid="1645022444510" d=8''andc=$12.

02

Step 2. Write the formula for direct variation.

c=kd

03

Step 3. Substituting the values and finding the value of k.

c=kdk=cdk=128鈥�鈥�c=12,d=8k=1.5

04

Step 4. Now find the value of c, when k=1.5 and d=6.

c=kdc=1.5脳6c=9

05

Step 5. Simplified answer.

Hence, the cost of pizza will bec=$9.

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