At a fruit stall, 378 persimmons were sold in the morning and ⁵₇ of the remaining persimmons were sold in the afternoon. As a result, the number of persimmons left became ¹₅ of the total number of persimmons at first. Given that the persimmons were sold at $2.10 in packs of seven persimmons, how much did the fruit stall receive from the sale of the persimmons in the afternoon?
Fraction of the remaining persimmons left
= 1 - ⁵₇
= ²₇

Make numerators the same.
²₇ of remaining persimmons = ¹₅ of total persimmons
²₇ of remaining persimmons = ²₁₀ of total persimmons

10 u - 7 u = 378
3 u = 378
1 u = 378 ÷ 3 = 126

Number of persimmons sold in the afternoon
= 5 u
= 5 x 126
= 630

Number of packs of seven persimmons sold in the afternoon
= 630 ÷ 7
= 90

Amount received for persimmons sold in the afternoon
= 90 x 2.10
= $189

Answer(s): $189