The lengths of two bodies measured by a metre scale are l_1=(20_-^+0.5)cmand l_2=(15_-^+0.2)cm Calculate: Sum of these lengths

The lengths of two bodies measured by a metre scale are l_1=(20_-^+0.5

1.	The lengths of two bodies measured by a metre scale are l_1=(20_-^+0.5)cmand l_2=(15_-^+0.2)cm Calculate: Sum of these lengths
Answer» SOLUTION :`(35_-^+0.7)CM`