Richard o nna mo ntlong e e nang le dithaba di le 15. Thobano nngwe le nngwe e na le diyuniti di le 8, mme 3/4 ya ntlo e na le batho. Ke diyuniti di le kae tse di senang batho mo ntlong?

Richard lives in an apartment building with 15 floors. Each floor contains 8 units, and 3/4 of the building is occupied. What's the total number of unoccupied units In the building?
Palo ya diyuniti mo ntlong e tla nna diyuniti di le 8/thobano * dithaba di le 15 = <<8*15=120>>120 diyuniti.
Fa 3/4 ya ntlo e na le batho,  go raya gore palo ya diyuniti tse di nang le batho ke 3/4 * diyuniti di le 120 = <<3/4*120=90>>90 diyuniti.
Palo ya diyuniti tse di senang batho ke diyuniti di le 120 - diyuniti di le 90 = <<120-90=30>>30 diyuniti. 
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The total number of units in the building will be 8 units/floor * 15 floors = <<8*15=120>>120 units.
If 3/4 of the building is occupied, then the total number of occupied units is 3/4 * 120 units = <<3/4*120=90>>90 units.
The total number of unoccupied units is 120 units - 90 units = <<120-90=30>>30 units.
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