TITLE: Need help solving word problem
QUESTION [0 upvotes]: I'm having difficulty solving this word problem. I just don't get it at all. I'm not too good with word problems. If anyone could help me; then that would be very helpful. 
Simple calculator costs $\$5$ and scientific calculator costs $\$16$.
The store sold $35$ calculators for total amount of $\$340$.
How many of each calculator were sold?

REPLY [0 votes]: I did it a little differently.  
5(35-X) + 16X = 340
175 - 5X + 16X = 340
175 + 11X = 340
11X = 165
X = 15
So 15 scientific and 20 regular calculators.

Or you could just as well approach it intuitively; for 16 you need a multiplier yielding a product ending in 0 and for 5 a multiplier yielding a product ending in 0 because there is no product of 16 which ends in ''5'' and the sum of the two products ends in ''0''.  In the case of 5 there are only four possibilities less than 35 and 0 doesn't work

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