A battery-operated device needs to function for 28.2 hours. It functions for an average of 4.03 hours on one battery. Write down a calculation you could do mentally to estimate the number of batteries required.
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Step-by-step explanation:
If one battery works for 4.03 hrs then:
The no. of batteries needed to power the device will be :
=28.2÷4.03
=6.9975...
≈7
therefore 7 batteries will be needed
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