AlgebraEasy–MediumOne value from a two-variable equation in context
Algebra practice question
A café sells sandwiches for $6 and juices for $4. The equation 6s + 4j = 26 relates the numbers of sandwiches s and juices j in a $26 order. If the order has 3 sandwiches, how many juices does it have?
Answer: 2
Substitute s = 3: 18 + 4j = 26, so 4j = 8 and j = 2.
Common wrong answers
- If you answered 4
- 4 comes from 18 + 4j = 26 solved as 4j = 16 (adding 18 instead of subtracting).
- If you answered 8
- 8 is 4j, the money spent on juice, not the number.
- If you answered 6.5
- 6.5 divides 26 by 4, ignoring the sandwiches.
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