A stereo

A stereo costs $321.99. Sean has $67.78, Matt has $48.20, and Mike has $51.80. If they put their money together to buy this stereo, how much more money do the boys need to buy the stereo?

Correct answer:

x =  154.21 USD

Step-by-step explanation:

s=321.99 a=67.78+48.20+51.80=167.78 USD  x=sa=321.99167.78=154.21 USD

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