20 dollars added to 5 dollars is 25 dollars (not 35).
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it's possible only if there are 20 cent coins only for that 7 dollars 1 dollar = 100 cents, 100 cents = 5 of 20 cent coins since you need 5 of 20 cent coins for a dollar, you do 7 times of it. 7 X 5 = 35. Therefore, you need 35 of 20 cent coins for 7 dollars. (or there are 35 of 20 cent coins in 7 dollars)
20
It is 5 because: 35-1,5,7,35 20-1,2,4,5,10,20 & 15-1,3,5,15
100/5 = 20
35% of 20 = 35% * 20 = 0.35 * 20 = 7