Battery Operated Televisions

Algebra 1 H SAT Question(s)?

1. Every 5 months, Hal has to replace the batteries in his calculator. He changed them the first time in Mt. In what month will they be changed the 25th time? 2. The energy saved from 1 recycled aluminum can will operate a television set for 3 hours. How many aluminum cans would have to be recycled to furnish enough energy to operate 680 tv sets for 4.5 hours per day for 1 week? Please help. Thanks in advance.

Public Comments

1. 1. He has 24 changes left, each at an interval of 5 months. 24x5 = 120 months, or 10 years even. Uncertain what month he changed the first one (Mt?), but the last one will be in the same month, just years later. 2. 1 can = 3 television-hours (680 televisions)(4.5 hours/day)(7 days) = 21420 television-hours (21420 television-hours)(1 can/3 television-hours) = 7140 cans