Answers

2014-08-25T15:17:43+08:00
4 times 21(there are 21 days in 3 weeks)
it is equal to 84 (she spends 84 pesos in 3 weeks)
divide 84 to 3(to find out how many days will it take 84 pesos if she will spend 3 pesos each day)

the answer is 28 days 
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2014-08-25T18:10:10+08:00
4 times 21 (days in three weeks)
84 divided by 3
= 28

her money will last for 28 days if he spend 3 pesos per day
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