WHICH SMART ASS can solve this primary 6 qn WITHOUT using algebra? Email me at sw_orion@yahoo.com.
Rick has some $10 phonecards and $25 phonecards. the number of $10phonecards is 1.5 times as much as $25 phonecards.He sold 1/3 of $10phonecards. the remaining value become $4200. what is the number of $10 phonecard sold?
The answer is 60.
THE INGENIOUS SOLUTION BY ANDREW CHAN...my pri 1 classmate. i have to say that i am impressed.
There are 1.5 times the number of 10 dollar notes, and u sell one third of them, so there are now exactly 1.0 times the number of phonecards. So for every $10 phonecard there is a $25 dollar phonecard 4200 / (10+25) = 120 There are 120 $10 phonecards now, and 120 $25 phonecards now
120 remaining $10 phonecards, therefore he must have sold 60 2/3 - 120 1/3 - 60
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stacy
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