220
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Given 20 and 50%, multiply 20 by 0.5, which equals 10. Given 70 and 30%, multiply 70 by 0.3, which equals 21. Or if you prefer, given 20 and 50%, multiply 2 by 5, which equals 10. Or if you prefer, given 70 and 30%, multiply 7 by 3, which equals 21.
15 and -4
Only one and eleven. Eleven is a prime number. Prime numbers are divisible by one and themselves only.
As a product of its prime factors: 2*163 = 326
It means 20 x 20 or 202 which equals 400.