79
Question
A worker earns Rs 490 in 7 days.How much he will earn in 30 days? In how many days he will earn Rs 8400 ?(by unitary method)
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Solution
In 7 days he earns 490 rs
in 1 day he earns 490/7 = 70 rs.
in 30 days he earns = 70 x 30 = 2100 rs.
for earning 8400 rs. he should work for = 30/2100 x 8400 = 120 days
in 1 day he earns 490/7 = 70 rs.
in 30 days he earns = 70 x 30 = 2100 rs.
for earning 8400 rs. he should work for = 30/2100 x 8400 = 120 days
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