Add: (a) 1 upon 10+ 4 upon 5
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Answered by
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64
Step-by-step explanation:
1 upon to 10 means = 1+2+3+4+5+6+7+8+9+10 that is 55
Same as 4 upon to 5 = 4+5 that is 9
And by adding 55 and 9 we get 64.
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