a) 645
b) 650
c) 640
d) 642
Answer: a
Explanation:
$$\eqalign{
& {\text{Total}}\,{\text{salary}}\,{\text{of}}\,660\,{\text{workers}} \cr
& = 660 \times 380 \cr
& = Rs.\,250800 \cr
& {\text{If}}\,{\text{other}}\,{\text{workers}}\,{\text{be}}\,x;\,{\text{then}}, \cr
& = \left[ {\left( {660 – x} \right) \times 2100} \right] + 340x \cr
& = 250800 \cr
& \,1386000 – 2100x + 340x = 250800 \cr
& 1760x = 1135200 \cr
& \,x = \frac{{1135200}}{{1760}} = 645 \cr
& {\text{Number}}\,{\text{of}}\,{\text{other}}\,{\text{workers}} = 645 \cr} $$
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