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Akwendu primary school has r pupils and matheka primary school has s pupils. A third school, kapsoti primary school has 150 pupils less than total number of pupils in Akwendu and matheka primary schools. Which one of the following expressions gives the total number of pupils in the three schools?
A. 2r+2s-150
B. r+s-150
C. 2r+2s+150
D. r+s+300