Question

Could someone help me with these three problems please?

Answer 1

1. 168

2. 239

3. 318

Explanation:

1. 10*21=210 7*6=42

210-42=168

2. 20*16=320 9*9=81

320-81= 239

3. 17*20=340 2*11=22

340-22=318