11+12=45 12+13=55 13+14=65 14+15=?
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Answer:75
(+5)or(+15) indicates adding 5or15
Explaination:
1)11+12=45
(+5)
2)12+13=55
(+15)
3)13+14=65
(+15)
4)14+15=75
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