Question
PSLE
Mr Koh bought some guppies at $10 each. He also bought an equal number of swordtails at a different price. The average price of a guppy and a swordtail was $9. Mr Koh paid $10 more for the guppies than the swordtails. How many guppies did he buy?
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PSLE
Mr Koh bought some guppies at $10 each. He also bought an equal number of swordtails at a different price. The average price of a guppy and a swordtail was $9. Mr Koh paid $10 more for the guppies than the swordtails. How many guppies did he buy?