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Vera_Pavlovna [14]
3 years ago
5

If james is starting to save $150 to buy a new cell phone. In January he saved $5. In February he saved twice as much as he save

d in January for a total of $15. If James continues to save twice as much each month as he saved the previous month, in which month will his totals savings be enough to buy the phone?
Need a step by step explanation please!
Mathematics
1 answer:
Anna [14]3 years ago
5 0

Answer:

  • May

Step-by-step explanation:

March end is 15*2=30+15 =45

April 45*2=90+45=135

By may james will have enough money for phone

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gulaghasi [49]

The question is essentially asking for the least common multiple of 20 and 25. There are several ways you can find the LCM. One easy way is to divide the product by the GCD (greatest common divisor).

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LCM(20, 25) = 20×25/GCD(20, 25)

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_____

You can also look at the factors of the numbers:

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The least common multiple must have factors that include all of these*, so must be ...

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___

* you can describe the LCM as the product of the unique factors to their highest powers. 20 has 2 raised to the 2nd power. 25 has 5 raised to the 2nd power, which is a higher power of 5 than is present in the factorization of 20. Hence the LCM must have 2² and 5² as factors.

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You can also look at the factorization of 20 and 25 to see that 5 is the only factor they have in common. That is the GCD, sometimes called the GCF (greatest common factor).

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