42 (half of 80 is 40 and 10% of 20 is 2, therefore 40 + 2)
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well, half of 40 is 20. 20 divided by 2 = 10 and 40 divided by 2 = 20 so now you have 10 over 20. then: 10 dived by 2 = 5 and 20 dived by 2 = 10 so now you have 5 over 10, and 5 is half of 10 so it is 1 over 2.
In fact, 1/10 + 1/10 + 1/20 + 1/4 + 1/2 is equal to 1.1/10= 2/20 1/4= 5/20 1/2= 10/202/20+2/20= 4/20+1/20=5/20+5/20=10/20+10/20=20/2020/20=1
20 + 50 + 20 + 10 = 50 = 150
10. 20 nickels make a dollar, and 20/2=10. Plus, a dollar is 100 cents, and half of that is 50, and 5x10=50. Hope I helped!
10 plus 20-2 - 11 plus 3 is equal to 20.