06 Apr, 2010
Cough Mixture
Ref : P3 Lesson 12
Simone went to the doctor on Tuesday night. She was told by her doctor to take 1 dose of cough syrup 3 times a day. She started to her first does of medication on Tuesday night. She went back to the doctor when her cough syrup ran out. Which day of the week did she go back to visit the doctor again?
>>Solution
Heuristic : Make a systematic list
Monday (night) : 5ml
Subsequent Days : 1 dose x 3 times x 5ml = 15ml
90ml - 5ml (taken on Monday night) = 85 ml
85 รท 15 = 5 remainder 10
Here, ‘5’ means 5 more days : Tuesday - Saturday
Remainder ‘10’ means 10ml left after Saturday
10ml = 5ml (Sunday Morning) + 5ml (Sunday afternoon)
Answer : Simone will finish her medicine by Sunday afternoon.
She will go back to her doctor on SUNDAY.