Answer:
B, C, E
Step-by-step explanation:
Tips = $20 × 15%
$20 × 
$3
Total = $20
Without tips = $17
Things that can buy for $17 are B, C, E
You can use Guess and Check and divide the 50 pounds into 2 parts. Multiply the price for both and do square root for the prices. Then at the 2 square roots and see if they add up to $6.40. If not, then divide the 50 pounds into something else, like 30 and 20 or something like that.
It is less than 2. I hope this helps!
Q1

Q2 <em>D</em>
sry I don't hv time to ans more