Question

Solve 15 and 21, will give BRAINLIST!!

Answer 1

Answer:

Step-by-step explanation:

4/x=2/10

cross multiplication:

4*10=2*x

40=2x

x=40/2=20

w/2 = 4.5/6.8

6.8w=2(4.5)

6.8w=9

w=9/6.8=1.32352941

Answer 2

the answer for 1 is 40/2=20