10x20 + 5x10
=200 + 50
=250
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To solve this problem, we first calculate the sum of 2 tens and 10 twos: 2 tens = 20, 10 twos = 20, so the sum is 20 + 20 = 40. Next, we determine how many fives are equal to 40 by dividing 40 by 5, which equals 8. Therefore, there are 8 fives that have the same value as the sum of 2 tens and 10 twos.
5/10 - 3/10 = 2/10 = 1/5
620 is the sum of 5 x 100 and 12 x 10. But a real number in the decimal system cannot have a "12" as a tens digit.
5*10 = 50
The sum is 50+20 = 70