# 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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