13. A labourer earns 1980 in 12 days.
(1) How much does he earn in 7 days?
(ii) In how many days will he earn 2640?
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in 12 days he earns=1980
in 1 day he earns=1980/12
in 7 days he earns=1980x7 ÷12
=13860/12=1155
165 rs. = 1 day
1 rs. = 1/165
2640 rs.= 1x2640÷165
=16 days.
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