Answer:
① n = 10
② n = 3
③ n = 0
④ n = 6
⑤ n = 2
Solution:
① 2/5=4/n
⇒2n/2 = 20/2 ⇒ cross multiplication and divide both side by 2
⇒ n = 10
② 9/n=6/2
⇒ 18/6 = 6n/6 ⇒ Cross multiply and divide both side by 6
⇒ n = 3
③ n/5=6/30
⇒ 30n/30 = 30/30 ⇒ cross multiplication and divide both side by 30
⇒ n = 0
④ 12/8 = n/4
⇒ 48/8=8n/8 ⇒ cross multiplication and divide both side by 8
⇒ n = 6
⑤ n/10=3/15
⇒ 15n/15=30/15 ⇒ cross multiplication and divide both side by 15
⇒ n = 2
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