2j+5=21
2j=16
j=8
<span>Jack is 8 years old.
</span>
Hope This Helped! :3
Let
x-------> the cost of each pepperoni pizza
y-------> the cost of each cheese pizza
z-------> the cost of each Hawaiian pizza
we know that
------> equation A
-----> equation B
-----> equation C
Substitute equation B and equation C in equation A
solve for x
therefore
<u>the answer is</u>
4 is your answer
3 x 4 = 12
15 x 4 = 60
so 4 is the amount
hope this helps
Answer:
3
Step-by-step explanation: