A store sells erasers for $.23 each and pencils for $.11 each. IF Jessica buys both erasers and pencils from the store for a total of $1.70, what number of erasers and pencils did she buy.
This is from Mgmat Word translation book however will a problem like this ever asked to be solved or just DS. Either way is there any easy way to solve this? The book explanantion is just very long and not really practical.
I don't know if I'm right but it is it 10? (5 per item)?
I solved it this way: if we multiply by 100 -> 23E+11P=170. 170 is an even number so E&P must either BOTH be odd or both be even. Because if E is odd and P is even we have an O+E, which does not equal an even number so it cannot be 170.
After that I just picked numbers by thinking how close the result would be to 170. 5 seemed like a good starting point and it worked out... (You could easily have picked 6 and realized that 6 was too big and just worked down).
5*23+5*11 = 170. So it should be 10.