Question

give the and. of 3 and 4 EXPLAIN HOW U GOT IT

Answer 1

3 H+L=10×2=20 (H- UPPER limit , L- LOWER LIMIT)
H-L=6
2H =26
H=13
H+L=20
L=20-13=7
4 H-L =5
H-10=5
H=15