Well, actually, I’m in book 6B, but for some reason that one wasn’t available through Amazon. Anyway, yes, I’ve been doing math for fun. Much to my children’s puzzlement and disbelief.
This problem is a cool one, just requiring a little logic to think it through.
Harry gave Tom and Dick as many marbles as each already had. Then Dick gave Tom and Harry as many marbles as each then had. Finally, Tom gave Dick and Harry as many marbles as each then had. The 3 boys ended up with 8 marbles each. How many marbles did each boy have at first?
Love that convoluted process–why didn’t they just throw them all together and then divvy them up equally, anyway? Oh, yeah, because it’s so fun to figure it out!
Now this one has me stumped so far! See if you can figure it out.
5 roosters, 2 hens, and 2 chicks weigh 15.7 kg. 3 roosters and 3 hens weigh 12 kg. Each chick weighs 0.4 kg. If each hen weighs the same and each rooster weighs the same, what is the total weight of 5 roosters and 2 chicks?
Huh? Say what? I guess when they say Intensive in Singapore, they mean Intensive! Sometimes the biggest challenge for me is to figure out a way to do it without algebra. With this one, though, I’m not even coming up with an algebraic way. Oh, well, it’s late. Maybe another day. I’m not looking at the answer. Yet.
I bought this book for my 12 year old son, who is now working in Singapore level 6B, but after working through some of it myself, I’m seriously wondering whether to give it to him. We may just go on to algebra–it might be easier!