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On Serna's tenth birthday, her mom was 3 times Serena's age. How old will Serena and her mom be when her mom's age times 0.5 will equal Serena's age?

Respuesta :

the answer is going to be 15
The answer is 20 because since Serena is 10 and her mother is 3 times her age. So 10x3= 30 and 0.5 or 1/2 of her moms age is 20 so when her mom is 40 serna will be 20 and her mom had her at 20

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