This is from me getting it wrong

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest