 
<translate> Akwai ɗalibai 19 a aji na uku kuma sau biyu a aji na huɗu. Akwai yara maza 10 da mata 19 a aji na biyu. Dalibai nawa ne a duka? Ni: Hmmm, bari in yi tunani. Ina ganin wannan shi ne cikakken bayani: <eng> Lizzy: There are 19 students in the 3rd grade and twice that number in the 4th grade. There are 10 boys and 19 girls in the 2nd grade. How many students are there in total?.
Me: Hmmm, let me think. I think this is the detailed solution: 