math

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jim is 45 years old. He is 10 years older than 5 times his niece. How old is carol?

  • math -

    J = Jim age

    C = Carol age


    J = 45

    J = 10 + 5 C

    45 = 10 + 5 C Subtract 10 to both sides

    45 - 10 = 10 + 5 C - 10

    35 = 5 C Divide both sides by 5

    35 / 5 = C

    7 = C

    C = 7

    Carol is 7 yo


    Proof :

    5 * 7 + 10 = 35 + 10 = 45

  • math -

    Mark has received a tax refund. He used 1/4 of the money to pay off his credit card. Than he spent 1/3 of the remaining money on new clothes and shoes for his kids. After shopping he used 1/5 of what was left to go out to eat. Finally, donated 1/2 of what was left to the food bank. This all left Mark with $128. How much did Mark receive?

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