Can you? 5 minutes for each question. Primary 6 standard only. Easy one la!
If Kenny gives 18 marbles to Andrew, he will have thrice as many marbles as Andrew. If Andrew gives 12 marbles to Kenny, he will have 1/9 of the numbers that Kenny has. How many marbles does Kenny have at first?
ANS: 168
I have some 50-cents coin and 20-cents coin (ratio 3:5) in the piggy bank. If I take out 6 50-cents coin and change them to 20-cents coin and put them back the ratio is now 3:10. How much money do I have?
ANS: $17.50 (21 50c coins 35 20c coins)
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