Enver has a $20 gift card for a smoothie shop. he calculates that if he buys a smoothie for $5.10 and a pack of almonds for $1.90, he will have $17.30 left on his card. which best shows whether or not this is a reasonable answer, and why? this is a reasonable answer because 20 – 5 + 1 = 16. this is a reasonable answer because 20 – 5 + 2 = 17. this is not a reasonable answer because 20 – 5 – 2 = 13. this is not a reasonable answer because 20 – 10 – 2 = 8.